Process image "Local control
In the factory setting, "Local control" is disabled. It is enabled when the ZPA operation is put into operation. See chapter Commissioning.
If the Predefined PDO Assignment "Local control" is enabled, the process image contains variables for monitoring and controlling the ZPA operation.
In the following sections, the letter n serves as a placeholder for the channel number.
Screenshots showing process data objects of channel 1 are used as examples for both channels. The process data objects of channel 1 and channel 2 have the same content structure.
STM Inputs Device
| "STM Inputs Device" contains diagnostic bits that you can use to narrow down the cause of a warning or an error. See chapter Diagnosis bits. |
ZNCTRL Inputs Channel n
| Moving EP7402 currently drives the motor. The zone is conveying. Zone sensor input The current state of the zone sensor. Upstream control input value The current state of the control signal received by the controller from the upstream zone. With the value 1, the preceding zone announces a package. See chapter ZPA operation with EP7402. Upstream control output value The current signal level of the control signal that the controller sends to the upstream zone. The value 1 means that the zone is free. See chapter ZPA operation with EP7402. Downstream control input value The current signal level of the control signal received by the controller from the downstream zone. The value 1 means that the following zone is free. See chapter ZPA operation with EP7402. Downstream control output value The current signal level of the control signal that the controller sends to the downstream zone. With the value 1 the controller announces a package. See chapter ZPA operation with EP7402. Reset input value The current state of the external reset input. Zone state The current state of the ZPA state machine. See chapter State machine. |
ZNCTRL Outputs Channel n
| Reset Apply a rising signal edge to this bit to acknowledge an error. Disable Disable ZPA mode for this zone. Upstream PLC input value (available from firmware 05) Variable for ZPA communication via EtherCAT. Downstream PLC input value (available from firmware 05) Variable for ZPA communication via EtherCAT. |
