Motion Group Shutdown Reset (MGSR)
This information applies to the
CompactLogix
5370, ControlLogix
5570, Compact GuardLogix
5370, GuardLogix
5570, Compact GuardLogix
5380, CompactLogix
5380, CompactLogix
5480, ControlLogix
5580, and GuardLogix
5580 controllers.Use the Motion Group Shutdown Reset (MGSR) instruction to transition a group of axes from the shutdown operating state to the axis ready operating state. As a result of this command, all faults associated with the axes in the group are cleared and any OK relay contacts of motion modules associated with the specified group are closed.
Available Languages
Ladder Diagram
Function Block
This instruction is not available in function block.
Structured Text
MGSR(Group,MotionControl);
Operands
Ladder Diagram and Structured Text
Operand | Type | Format | Description |
Group | MOTION_GROUP | Tag | Name of the group of axes on which to perform operations. |
Motion Control | MOTION_INSTRUCTION | Tag | Structure used to access instruction status parameters. |
See
Structured Text Syntax
for more information on the syntax of expressions within structured text. MOTION_INSTRUCTION Structure
Mnemonic | Description |
.EN (Enable) Bit 31 | The enable bit indicates when the instruction is enabled. It remains set until servo messaging completes and Rung-condition-in goes false. |
.DN (Done) Bit 29 | The done bit indicates when the instruction resets the group of axes from the shutdown operating state. |
.ER (Error) Bit 28 | The error bit indicates when the instruction detects an error, such as if messaging to the servo module failed. |
Description
The MGSR instruction takes all the axes in the specified group out of the Shutdown state by clearing all axis faults and closing any associated OK solid-state relay contacts for the motion modules within the group. This action places all axes within the motion group in the Axis Ready state.
Just as the Motion Group Shutdown (MGSD) instruction forces all the axes in the targeted group into the Shutdown state. The MGSR instruction takes all the axis in the specified group out of the Shutdown state and into the Axis Ready state. One of the unique characteristics of the Shutdown state is that, if supported, the OK solid state relay contact for each of the group’s motion modules is Open. Hence, the result of an MGSR instruction applied to a group of motion modules is that all motion module OK relay contacts close. This feature can be used to close the E-Stop strings that control main power to the various drive systems and permits the customer to reapply power to the drives.
To successfully execute a MGSR instruction, the targeted group must be configured.
IMPORTANT:
The instruction execution may take multiple scans to execute because it requires multiple coarse updates to complete the request. The Done (.DN) bit is not set immediately, but only after the request is completed.
This is a transitional instruction:
- In relay ladder, toggle Rung-condition-in from false to true each time the instruction should execute.
- In structured text, condition the instruction so that it only executes on a transition.
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See
Common Attributes
for operand-related faults.Execution
Ladder Diagram
Condition/State | Action Taken |
Prescan | The .EN, .DN, .ER, and .IP bits are cleared to false. |
Rung-condition-in is false | The .EN bit is cleared to false if either the .DN or .ER bit is true. |
Rung-condition-in is true | The .EN bit is set to true and the instruction executes. |
Postscan | N/A |
Structured Text
Condition/State | Action Taken |
Prescan | See Prescan in the Ladder Diagram table. |
Normal execution | See Rung-condition-in is false, followed by rung is true in the Ladder Diagram table. |
Postscan | See Postscan in the Ladder Diagram table. |
Status Bits
MGSR Changes to Status Bits
Bit Name | State | Meaning |
ServoActionStatus | FALSE | Axis in Servo Off state with the servo loop inactive. |
DriveEnableStatus | FALSE | Axis Drive Enable output is inactive. |
ShutdownStatus | FALSE | Axis is in Shutdown state. |
Examples
When the input conditions are true, the controller transitions all axes in group1 from the shutdown operating state to the axis ready operating state.
Ladder Diagram
Structured Text
MGSR(Motion,MGSR_3);
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