Feedback monitoring
Feedback monitoring compares the states of the switching request *Ctrl with the respective feedback contacts *Fbk. A distinction is made between static and dynamic errors during monitoring. The monitoring function is enabled by the variable MonEn by an operator (e. g. via OPC UA) or initially in the module.
A static error MonStatErr is triggered by a change in the feedback contact if the switching request remains unchanged after the monitoring time MonStatTi has elapsed. An example of this is a motor where the supply voltage fails.
A dynamic fault MonDynErr is triggered by a change in the switching request without a resulting change in the feedback contact after the monitoring time MonDynTi has elapsed. This can be triggered, for example, by a contactor that remains "stuck".
The monitoring times in which the respective faults are triggered can be set by the internal PLC logic. The variable MonSafePos is used to describe the behavior of the interface when an error occurs.
Inputs
Name | Type | Description | OPC UA access |
|---|---|---|---|
MonStatTi | REAL | Monitoring time for static errors [s] | Read |
MonDynTi | REAL | Monitoring time for dynamic errors [s] | Read |
MonSafePos | BOOL | Behavior of the interface after an error occurs: 1: Safe position should be approached. 0: The current state is retained. | Read |
Outputs
Name | Type | Description | OPC UA access |
|---|---|---|---|
MonStatErr | REAL | Static error: 1: active 0: inactive | Read |
MonDynErr | REAL | Dynamic error: 1: active 0: inactive | Read |
External variables
Name | Type | Description | OPC UA access |
|---|---|---|---|
MonEn | BOOL | Enable 1: 0: | Read/write |