Module Data Types - 1794-VHSC
The table below lists and describes module-defined data types for the 1794-VHSC module. It includes information for input (as indicated by an "I"), and for configuration (as indicated by a "C") in the module Tag Type name shown on the Controller Tags window in the
Logix Designer
application.Tip: | FLEX I/O and FLEX Ex are based on 16-bit INTs and not-32-bit DINTs. This may decrease performance with certain instructions. |
Module-defined Data Type: AB:1794_VHSC:I:0
Member Name | Type | Default Display Style | Description |
Fault | DINT | Binary | Fault - Used for Input Data Validation 0 = Valid Data 1 = Invalid Data - if the connection to the module has been lost, or if the module has a severe hardware fault, the lower 8 bits are set to 1. |
Ch0CurrentCount | DINT | Decimal | Current count of 24-member counter or the frequency for Channel 0. |
Ch1CurrentCount | DINT | Decimal | Current count of 24- member counter or the frequency for Channel 1. |
Ch0StoredCount | DINT | Decimal | Stored counter value for Channel 0. |
Ch1StoredCount | DINT | Decimal | Stored counter value for Channel 1. |
Status (Bit Definitions) During Normal Operation | INT | Binary | Status data. The meaning of these members change depending on the:
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Ch0Zinput | BOOL | Decimal | Present status of Z input for Channel 0. When incomplete, incorrect, or conflicting configuration data are encountered, the ConfigurationError member, discussed below, is set. Z input represents the present status of the Z input. 0 = Off 1 = Input on This member is unaffected by Z invert in the configuration data type. In period/rate and continuous/rate, counts are acquired during On state of the Z input. At very low frequencies, the counter saturates, indicating a zero frequency detect. (The time it takes to determine a zero frequency in these 2 configurations can be as long as 6.7s or 16,777,215 counts X 1/5MHz X 2 half cycles of Z.) In rate measurement, pulses on Z input are counted over a sample interval specified by the product of time base X gate interval. (The time to detect a zero frequency is determined by the sample interval, for example, if time base = 0.100s and gate interval = 3, 300ms is used to determine ZeroFrequencyDetect). |
Ch0ZeroFrequencyDetect | BOOL | Decimal | In rate measurement, pulses on Z input are counted over a sample interval specified by the product of time base X gate interval. (The time to detect a zero frequency is determined by the sample interval, for example, if time base = 0.100s and gate interval = 3, 300ms is used to determine ZeroFrequencyDetect). This member is used only when frequency configurations are selected. |
Ch0StoredData2 Ch0StoredData3 | BOOL | Decimal | A rotating counter (along with the Ch0StoredData3 member) which increments each time the Stored Count members are updated, resetting to zero on the next count after 3 is reached in the Ch0StoredData3 member. The controller sample rate, including network delay and program scan, must be as fast or faster than the frequency of the event which updates. |
Ch1Zinput | BOOL | Decimal | The indicated present status of Z input for Channel 1. |
Ch1ZeroFrequencyDetect | BOOL | Decimal | Used only when frequency configurations are selected. |
Ch1StoredData6 Ch1StoredData7 | BOOL | Decimal | A rotating counter (along with the Ch0StoredData7 member) which increments each time the Stored Count members are updated, resetting to zero on the next count after 3 is reached in the Ch0StoredData7 member. The controller sample rate, including network delay and program scan, must be as fast or faster than the frequency of the event which updates. |
Output0 Output1 Output2 Output3 | BOOL | Decimal | Output status indicator: 1=ON and 0=OFF. |
TestFail | BOOL | Decimal | Hardware self-test fatal fault conditions. |
NotReady | BOOL | Decimal | Indicates a status of "unconfigured" for the module. |
FieldPowerFault | BOOL | Decimal | Module's 24V DC power fault indication. |
ConfigurationError | BOOL | Decimal | When set, this member indicates that incomplete, incorrect, or conflicting configuration data was sent to the module causing the module’s status indicators to flash. |
Module-defined Data Type:AB:1794_VHSC:O:0
Member Name | Type | Default Display Style | Description |
CounterControl | INT | Counter data. | |
Ch0CounterReset Ch1CounterReset | BOOL | When one of these members are set to 1, the associated counter is reset to zero and begins counting. The module can also be reset with the Gate Interval member of the configuration data type. Outputs are adjusted according to the window compare values. | |
Ch0CounterPreset Ch1CounterPreset | BOOL | In encoder or counter modes, this member represents a reference point (or count) from which the module begins counting. The module can count either up or down from the preset value. Values can range from 0 to 16,777,215. Outputs are adjusted according to the window compare values. | |
Ch0ValueReset Ch1ValueReset | BOOL | A 0 to 1 transition of this member clears the stored/accumulated count data in the Stored Data members of the input data type. | |
OutputControl | INT | Output control data. | |
Out0Force Out1Force Out2Force Out3Force | BOOL | When set to 1, output is turned on if the associated Output Enable member is 1. When set to 0, output can be controlled by a compare window match, or as directed by the Pulse Width Modulation (PWM) settings. | |
Out0Enable Out1Enable Out2Enable Out3Enable | BOOL | When set to 1, output can be turned on from a force on, compare window match, or as directed by the PWM settings. When set to 0, the associated output is turned off. | |
Out0Local Out1Local Out2Local Out3Local | BOOL | When set to 1, output is controlled by the counter if the Flexbus power is lost. (i.e. the module detects a Flexbus reset signal) Tip: When Flexbus power is lost, communication to the controller is lost. When set to 0 and loss of Flexbus power, the module clears its Output Enable members. Set this member as appropriate in the Safe State Output Endable member of the configuration data type, in response to a communication fault occurring after adapter power is lost. | |
Ch0PWMOutput Ch1PWMOutput | INT | When the module is configured for PWM, the time base is enabled, the counter for the respective channel, its gate interval, rollover, and 1st on and 1st off value are used. Ties can be used to direct the PWM signal to any or all outputs. The range of the PWM values is 0 < value < 9500 decimal (i.e. 0.00% < value < 95.00%). The actual duty cycle at the output depends on the turn on and turn off times of the MOSFET, energy storage capability of the cable/load and the resistance from output to return. |
Module-defined Data Type:AB:1794_VHSC:C:0
Member Name | Type | Default Display Style | Description | ||
Config | INT | Binary | Counter Configuration data. The following table shows distribution of Counter data and Mode selection data. | ||
Counter Configuration – The following members are for counter configuration. | |||||
Counter0Config3 | Counter0Config2 | Counter0Config1 | Counter0Config0 | Counter Configuration | |
Counter1Config11 | Counter1Config10 | Counter1Config9 | Counter1Config8 | ||
0 | 0 | 0 | 0 | Counter | |
0 | 0 | 0 | 1 | Encoder | |
0 | 0 | 1 | 0 | Encoder X2 | |
0 | 0 | 1 | 1 | PWM | |
0 | 1 | 0 | 0 | Encoder X4 | |
0 | 1 | 0 | 1 | Period/Rate | |
0 | 1 | 1 | 0 | Continuous/Rate | |
0 | 1 | 1 | 1 | Rate Measurement | |
Mode Selection – The following members are for operational mode selection. | |||||
Counter0Mode6 | Counter0Mode5 | Counter0Mode4 | Mode Selection | ||
Counter1Mode14 | Counter1Mode13 | Counter1Mode12 | |||
0 | 0 | 0 | Store count disabled | ||
0 | 0 | 1 | Mode 1 – store/continue | ||
0 | 1 | 0 | Mode 2 – store/wait/resume | ||
0 | 1 | 1 | Mode 3 – store;reset/wait/start | ||
1 | 0 | 0 | Mode 4 – store;reset/start | ||
Counter0Zinvert Counter1Zinvert | BOOL | Decimal | Invert the gate/reset logic. If your gate/reset input (i.e. the Z input) is normally high and goes low when some event happens, you'll want this member set so the 1794-VHSC will see the gate/reset low until the event happens. 0 = do not invert Z value 1 = invert Z value | ||
FilterConfig | INT | Binary | Filter configuration data. | ||
Filter Configuration – The following members are for filter rate configuration. | |||||
Counter0Filter3 | Counter0Filter2 | Counter0Filter1 | Counter0Filter0 | Filter Configuration | |
Counter1Filter11 | Counter1Filter10 | Counter1Filter9 | Counter1Filter8 | ||
0 | 0 | 0 | 0 | No filter | |
0 | 0 | 0 | 1 | 50kHz (10ms + 0ms/–1.6ms) | |
0 | 0 | 1 | 0 | 5kHz (100ms + 0ms/–13.2ms) | |
0 | 1 | 0 | 0 | 500Hz (1.0ms + 0ms/–1.25ms) | |
1 | 0 | 0 | 0 | 50Hz (10.0ms + 0ms/–1.25ms) | |
Counter0Afilter Counter1Afilter | BOOL | Decimal | Input A filter - 0 = not filtered; 1 = apply filter to input for Counter0Afilter and/or Counter1Afilter. | ||
Counter0Bfilter Counter1Bfilter | BOOL | Decimal | Input B filter - 0 = not filtered; 1 = apply filter to input for either Counter0Bfilter or Counter1Bfilter. | ||
Counter0Zfilter Counter1Zfilter | BOOL | Decimal | Input Z filter - 0 = not filtered; 1 = apply filter to input for either Counter0Zfilter or Counter1Zfilter. | ||
TimeBase | INT | Decimal | Sets the fundamental time base for both counters. Resolution in ms, with a minimum of 10ms intervals (10ms = 10; 1s = 1000). Time base must be entered when PWM and rate measurement are configured. The maximum programmed value is 3000. | ||
Ch0GateInterval Ch1GateInterval | INT | Decimal | Sets the individual counter gate interval using the time base setting as its time unit for either Ch0GateInterval or Ch1GateInterval. Actual gate interval is time base X gate interval (i.e. time base of 10 X gate interval of 5 = 50ms). Maximum value is 0 < GateInterval < 200. Gate interval must be entered when PWM and rate measurement are configured. | ||
Ch0Rollover Ch1Rollover | DINT | Decimal | Set the number of counts the counter accumulates before rolling over (for channels 0 or 1). For example, a setting of 1000 produces a count sequence of 998, 999, 0, 1, 2... while incrementing; and 2, 1, 0, 999, 998... while decrementing. Rollover is a 32–bit number with a usable range of 16,777,216. In PWM, this value is zero; in count, X1 encoder, X2 encoder and X4 encoder configurations, it must be some specified nonzero number. The value doesn’t matter in period/rate, continuous/rate and rate measurement configurations. | ||
Ch0Preset Ch1Preset | DINT | Decimal | These members set the preset value the counter is loaded with when either Ch0Preset or Ch1Preset is asserted. This number has a range of 0 < value < 16,777,215. | ||
Ch0Scalar Ch1Scalar | INT | Decimal | These members scale the Z signal in period/rate and continuous/rate modes only. If the filter is applied, the filtered Z signal is scaled. Set only 1 member of the Ch0Scalar and/or Ch1Scalar. Selecting a Scalar causes accumulated counts to be adjusted accordingly (i.e., selecting a Scalar of 128 increases the accumulated count by 128 after 128 Z pulses have been received). We recommend using the filter to reduce erroneous frequency readings any time you use the Scalar on the Z input. Calculated values are shown in the table below. | ||
1 2 4 8 16 32 64 128 | Fmins = 0.149Hz Fmins = 0.298Hz Fmins = 0.596Hz Fmins = 1.192Hz Fmins = 2.384Hz Fmins = 4.768Hz Fmins = 9.537Hz Fmins = 19.073Hz | ||||
OutputTies1 | SINT | Binary | These members connect the first specified output to the appropriate compare window. There are 8 windows, 4 per counter. Each output can be connected to any number of windows, from 1 to 8 listed below. | ||
OP1Counter1Window1 | BOOL | Decimal | F1 = Tie output to First counter 1st window. | ||
OP1Counter1Window2 | BOOL | Decimal | F2 = Tie output to First counter 2nd window. | ||
OP1Counter1Window3 | BOOL | Decimal | F3 = Tie output to First counter 3rd window. | ||
OP1Counter1Window4 | BOOL | Decimal | F4 = Tie output to First counter 4th window. | ||
OP1Counter2Window1 | BOOL | Decimal | S1 = Tie output to Second counter 1st window. | ||
OP1Counter2Window2 | BOOL | Decimal | S2 = Tie output to Second counter 2nd window. | ||
OP1Counter2Window3 | BOOL | Decimal | S3 = Tie output to Second counter 3rd window. | ||
OP1Counter2Window4 | BOOL | Decimal | S4 = Tie output to Second counter 4th window. | ||
OutputTies2 | SINT | Binary | These members connect the second specified output to the appropriate compare window. There are 8 windows, 4 per counter. Each output can be connected to any number of windows, from 1 to 8 listed below. | ||
OP2Counter1Window1 | BOOL | Decimal | F1 = Tie output to First counter 1st window. | ||
OP2Counter1Window2 | BOOL | Decimal | F2 = Tie output to First counter 2nd window. | ||
OP2Counter1Window3 | BOOL | Decimal | F3 = Tie output to First counter 3rd window. | ||
OP2Counter1Window4 | BOOL | Decimal | F4 = Tie output to First counter 4th window. | ||
OP2Counter2Window1 | BOOL | Decimal | S1 = Tie output to Second counter 1st window. | ||
OP2Counter2Window2 | BOOL | Decimal | S2 = Tie output to Second counter 2nd window. | ||
OP2Counter2Window3 | BOOL | Decimal | S3 = Tie output to Second counter 3rd window. | ||
OP2Counter2Window4 | BOOL | Decimal | S4 = Tie output to Second counter 4th window. | ||
OutputTies3 | SINT | Binary | These members connect the third specified output to the appropriate compare window. There are 8 windows, 4 per counter. Each output can be connected to any number of windows, from 1 to 8 listed below. | ||
OP3Counter1Window0 | BOOL | Decimal | F1 = Tie output to First counter 1st window. | ||
OP3Counter1Window1 | BOOL | Decimal | F2 = Tie output to First counter 2nd window. | ||
OP3Counter1Window2 | BOOL | Decimal | F3 = Tie output to First counter 3rd window. | ||
OP3Counter1Window3 | BOOL | Decimal | F4 = Tie output to First counter 4th window. | ||
OP3Counter2Window0 | BOOL | Decimal | S1 = Tie output to Second counter 1st window. | ||
OP3Counter2Window1 | BOOL | Decimal | S2 = Tie output to Second counter 2nd window. | ||
OP3Counter2Window2 | BOOL | Decimal | S3 = Tie output to Second counter 3rd window. | ||
OP3Counter2Window3 | BOOL | Decimal | S4 = Tie output to Second counter 4th window. | ||
OutputTies4 | SINT | Binary | These members connect the fourth specified output to the appropriate compare window. There are 8 windows, 4 per counter. Each output can be connected to any number of windows, from 1 to 8 listed below. | ||
OP4Counter1Window1 | BOOL | Decimal | F1 = Tie output to First counter 1st window. | ||
OP4Counter1Window2 | BOOL | Decimal | F2 = Tie output to First counter 2nd window. | ||
OP4Counter1Window3 | BOOL | Decimal | F3 = Tie output to First counter 3rd window. | ||
OP4Counter1Window4 | BOOL | Decimal | F4 = Tie output to First counter 4th window. | ||
OP4Counter2Window1 | BOOL | Decimal | S1 = Tie output to Second counter 1st window. | ||
OP4Counter2Window2 | BOOL | Decimal | S2 = Tie output to Second counter 2nd window. | ||
OP4Counter2Window3 | BOOL | Decimal | S3 = Tie output to Second counter 3rd window. | ||
OP4Counter2Window4 | BOOL | Decimal | S4 = Tie output to Second counter 4th window. | ||
Counter0ON1 Counter0OFF1 Counter0ON2 Counter0OFF2 Counter0ON3 Counter0OFF3 Counter0ON4 Counter0OFF4 | DINT | Decimal | (Counter 1) There are eight compare windows (four per counter and four sourcing outputs) which may be tied in any mix to the four sourcing outputs. Each counter has an on and off value. The first compare window for each counter is used in PWM, and when programmed for PWM, the associated compare window should remain at 0. The range of each entry is 0 < value < 16,777,215. When a tie is connected to a window comparator, that window must be specified. These windows are always interpreted as counts, regardless of the configuration setting, and can be computed as follows: counts = (Scalar X 2500000)/desired frequency (for period/rate and continuous/rate) counts = time base X gate interval X desired frequency (for rate measurement) | ||
Counter1ON1 Counter1OFF1 Counter1ON2 Counter1OFF2 Counter1ON3 Counter1OFF3 Counter1ON4 Counter1OFF4 | DINT | Decimal | (Counter 2) There are eight compare windows (four per counter and four sourcing outputs) which may be tied in any mix to the four sourcing outputs. Each counter has an on and off value. The first compare window for each counter is used in PWM, and when programmed for PWM, the associated compare window should remain at 0. The range of each entry is 0 < value < 16,777,215. When a tie is connected to a window comparator, that window must be specified. These windows are always interpreted as counts, regardless of the configuration setting, and can be computed as follows: counts = (Scalar X 2500000)/desired frequency (for period/rate and continuous/rate) counts = time base X gate interval X desired frequency (for rate measurement) | ||
SSCounterControl | INT | Binary | Counter Control Safe State - When the controller transitions to Program Mode behavior or a communication fault occurs, the module copies the safe state data members into its real time working buffer. These members are identical to the those in the counter control members of the output data type, except that entering a PWM safe state value outside the range 0–9500 results in a Hold Last State. | ||
The following members are identical to the output module-defined data types with the exception of the SSPWM members. | |||||
SSCh0CounterReset SSCh1CounterReset | BOOL | Decimal | Counter Control Reset Safe State - When one of these members are set to 1, the associated CounterReset member of the output data type is reset to zero and begins counting. The module can also be reset with the Gate Interval member of the configuration data type. Outputs are adjusted according to the window compare values. | ||
SSCh0CounterPreset SSCh1CounterPreset | BOOL | Decimal | Counter Control Preset Safe State - In encoder or counter modes, this member represents a reference point (or count) from which the module begins counting. The module can count either up or down from the preset value. Values can range from 0 to 16,777,215. Outputs are adjusted according to the window compare values. | ||
SSCh0ValueReset SSCh1ValueReset | BOOL | Decimal | A 0 to 1 transition of this member clears the stored/accumulated count data in the Stored Data members of the input data type. | ||
SSOutputControl | INT | Binary | Output Control Safe State data - When the controller transitions to Program Mode or a communication fault occurs, the module copies the safe state data into its real time working buffer. The definitions are identical to the those in the counter control members, except entering a PWM safe state value outside the range 0–9500 results in a Hold Last State. | ||
SSOut0Force SSOut1Force SSOut2Force SSOut3Force | BOOL | Decimal | When set to 1, output is turned on if any of the Output Enable Safe State members are 1. When set to 0, output can be controlled by a compare window match, or as directed by the PWM settings. | ||
SSOut0Enable SSOut1Enable SSOut2Enable SSOut3Enable | BOOL | Decimal | When set to 1, output can be turned on from a force on, compare window match, or as directed by the PWM settings. When set to 0, the associated output is turned off. | ||
SSOut0Local SSOut1Local SSOut2Local SSOut3Local | BOOL | Decimal | When set to 1, output is controlled by the counter if the Flexbus power is lost. (i.e. the module detects a Flexbus reset signal) Tip: When Flexbus power is lost, communication to the controller is lost. When set to 0 and loss of Flexbus power, the module clears its Output Enable members. Set this member as appropriate in the safe state word, since a communication fault occurs after adapter power is lost. | ||
SSCh0PWM | INT | Decimal | Channel 0 PWM Safe State. Any PWM Safe State % value outside the range 0 to 95%, i.e., 9501 (95.01%) signals the 1794-VHSC to use Hold Last State for its PWM Safe State % value. | ||
SSCh1PWM | INT | Decimal | Channel 1 PWM Safe State. Any PWM Safe State % value outside the range 0 to 95%, i.e., 9501 (95.01%) signals the 1794-VHSC to use Hold Last State for its PWM Safe State % value. | ||
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