What happens?
Inputs and outputs of digital I/O 1000 modules connected to a CANopen bus coupler (EPM-S110) are not transferred correctly.
When does this behaviour occur?
The above-described behaviour occurs with digital 4-channel compound modules if the 4 channels (bits) of the I/O module are distributed to 2 bytes in the process image.
This is e.g. the case in the following constellation:
DI2 - DI4 - DI4
In this constellation, the function restriction occurs with the second DI4 module. As a result, for the second DI4 module, inputs 3 and 4 of the I/O module are not transferred to the process image of the controller and inputs 1 and 2 are written to the position in the process image at which inputs 3 and 4 would be expected.
This affects both the digital input modules (DI4) and the digital output modules (DO4).
Which products are affected?
PLC Designer from V3.0
EPM-S110 (I/O 1000 CANopen bus coupler)
EPM-S201 (I/O 1000 4 digital inputs)
EPM-S205 (I/O 1000 4 digital inputs, npn)
EPM-S301 (I/O 1000 4 digital outputs, 0.5A)
EPM-S305 (I/O 1000 4 digital outputs, 0.5A npn)
EPM-S309 (I/O 1000 4 digital outputs, 2A)
Short-term measures:
Check the station structure of the EPM-S110 CANopen bus coupler in the PLC Designer project. Make sure that the process image of the corresponding module is not distributed to 2 bytes in the process image when using digital 4-channel I/O modules (DI4 or DO4).
If possible place digital 2-channel I/O modules (DI2 or DO2) after the other digital modules in the station structure.
Evaluation/recommendations:
Depending on the station structure of the I/O 1000 CANopen bus coupler, the process image of digital 4-channel I/O modules is not transferred correctly. A remedy is described under 'Short-term measures'.
Note: No change is planned for this behavior!
