Module Data Types - 1794-IF2XOF2I

The table below lists and describes module-defined data types for the 1794-IF2XOF2I Combo module. It includes information for input (as indicated by an "I"), output (as indicated by an "O"), and configuration (as indicated by a "C").
TIP:
The OutputEnable configuration data type must be set to 1 in order for the Hold For Initialization feature to function. This value can be set in the Data Monitor from the Controller Tags window, or by using your own program. An example of the Hold For Initialization feature is outlined below.
When a communication fault or idle period is encountered, the module accepts the Safe State held by the adapter (in the SSSafeStateConfig0 and SSSafeStateConfig1 members). When communication is restored, the module’s output status is polled for each condition of output on each channel (in the Ch0OutputHeld and Ch1OutputHeld members) using the output data in the Ch0OutputReadBack and Ch1OutputReadBack members. When the output data matches the respective Ch0OutputReadBack and Ch1OutputReadBack values, the channel returns to normal operation and indicates this by clearing the Ch0OutputHeld and Ch1OutputHeld members. The members identified in this example are defined in the tables below.
TIP:
FLEX I/O is based on 16-bit INTs and not 32-bit DINTs. This may decrease performance with certain instructions.
Module-defined Data Type: AB:1794_IF2XOF2I: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.
Ch0InputData
INT
Decimal
Input data for channel 0.
Ch1InputData
INT
Decimal
Input data for channel 1.
Ch0OutputReadBack
INT
Decimal
Read back data for output channel 0. During a communication fault or idle period, it contains real time output data as well as any Safe State values sent by the adapter.
Ch1OutputReadBack
INT
Decimal
Read back data for output channel 1. During a communication fault or idle period, it contains real time output data as well as any Safe State values sent by the adapter.
RealTimeSample
INT
Decimal
Elapsed time in 5ms increments programmed by the Real Time Sample interval.
CalibrationDone
BOOL
Decimal
Set to 1 after calibration cycle completed.
CalibrationBad
BOOL
Decimal
Set to 1 if channel calibration coefficients cannot be saved or read properly.
ConfigurationMode
BOOL
Decimal
Set to 1 when configuration mode is selected. The module status indicator flashes when set.
FieldPowerOff
BOOL
Decimal
Set to 1 when the 24V field power fails. The module status indicator flashes when set.
PowerUp
BOOL
Decimal
This member is set when the configuration word is all zeros due to reset or a cleared configuration word. The module status indicator flashes when set.
Ch0InputUnderrange
BOOL
Decimal
This member is set when input channel 0 is below a preset limit defined by the selected configuration.
Ch1InputUnderrange
BOOL
Decimal
This member is set when input channel 1 is below a preset limit defined by the selected configuration.
Ch0InputOpenWire
BOOL
Decimal
This member is set when the output channel 0 current loop is open.
Ch1InputOpenWire
BOOL
Decimal
This member is set when the output channel 1 current loop is open.
Ch0InputOverrange
BOOL
Decimal
This member is set when input channel 0 is above a preset limit defined by the selected configuration.
Ch1InputOverrange
BOOL
Decimal
This member is set when input channel 1 is above a preset limit defined by the selected configuration.
Ch0OutputHeld
Ch1OutputHeld
BOOL
Decimal
Indicates that the output is holding at the level in the readback data for the respective channel during output enable. These data types return to 0 when the output data matches the readback.
Module-defined Data Type: AB:1794_IF2XOF2I:O:0
Member Name
Type
Default Display Style
Description
SafeStateConfig0
SafeStateConfig1
BOOL
Decimal
Designates the source of the Safe State data when output enable is 0.
OutputEnable
BOOL
Decimal
Always keep this member set to 1. It must be a 1 in order for the Hold For Initialization feature to function.
Ch0OutputData
INT
Decimal
Output data for channel 0.
Ch1OutputData
INT
Decimal
Output data for channel 1.
Module-defined Data Type: AB:1794_IF2XOF2I:C:0
Member Name
Type
Default Display Style
Description
InputFilter
SINT
Binary
Encoded input filter.
InputConfiguration
SINT
Binary
Encoded input configuration.
OutputConfiguration
SINT
Binary
Encoded output configuration.
RTSInterval
INT
Decimal
Real Time Sample programmed interval. Range 0-30000ms in multiples of 5.
Ch0InputCalibrate
BOOL
Decimal
Include Input channel 0 in calibration.
Ch1InputCalibrate
BOOL
Decimal
Include Input channel 1 in calibration.
Ch0OutputCalibrate
BOOL
Decimal
Include Output channel 0 in calibration.
Ch1OutputCalibrate
BOOL
Decimal
Include Output channel 1 in calibration.
GainOffsetCalibration
BOOL
Decimal
If set, gain calibration.
If clear, offset calibration.
CalibrationClock
BOOL
Decimal
If set to 1, calibration mode starts and coefficients for selected channels are accepted.
If clear, the accepted current calibration coefficients are stored to selected channels, applied and calibration mode is exited.
QuickCalibration
BOOL
Decimal
If set to 1, calibration coefficient is stored to all related configurations for selected channels.
Ch0OutputHold
BOOL
Decimal
If set, when a 1 to 0 to 1 transition of the Enable member, hold output level on channel 0 until the real time output data equals the level.
Ch1OutputHold
BOOL
Decimal
If set, when a 1 to 0 to 1 transition of the Enable member, hold output level on channel 1 until the real time output data equals the level.
InterleaveInterrupts
BOOL
Decimal
If set, ensures exchange of time critical data when channels are configured for the fastest update times. Do not check the Interleave Module Interrupts check box unless you know you have a specific use for this option. The Interleave Module Interrupts feature is useful only in limited circumstances and can only be enabled when you configured a module’s Conversion Rate to
1200 Hz
, Low Pass Time Constant to None, and Real Time Sampling period to
0
 for
ALL
 channels on the module.
Transparent
BOOL
Decimal
If set, permits configuration to be changed without using the InitiateConfiguration data type.
InitiateConfiguration
BOOL
Decimal
If set, instructs the module to enter configuration mode. When transition to 0 occurs, configuration is applied and any subsequent configuration is ignored until this member is toggled.
SSSafeStateConfig0
BOOL
Decimal
Safe state value to use for SafeStateConfig0.
SSSafeStateConfig1
BOOL
Decimal
Safe state value to use for SafeStateConfig1.
SSOutputEnable
BOOL
Decimal
Safe state value to use for OutputEnable.
SSCh0OutputData
INT
Decimal
Safe State value to use for Ch0OutputData.
SSCh1OutputData
INT
Decimal
Safe State value to use for Ch1OutputData.
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