Which products are affected?
ESP-SPAC-CAM1 – Software Package Cam V1.1 (template cam)
What happens?
The Servo PLC sporadically stops when template cam is used during the initialisation phase (the PLC program does not start).
When does the problem occur?
The problem occurs sporadically. It is due to an undefined state of the template variable g_byOperationState. If the variable g_byOperationState is accessed during the initialisation phase of the Servo PLC and g_byOperationState does not have a valid value (see below table) an undefined memory access occurs in the Servo PLC because there is no value assignment for the value 0:
1 Trouble => Fault
10 StandBy => Standby
20 ManJog => Inching mode/manual operation
30 Homing => Homing
40 Pos => Positioning
50 CamOperation => Cam operation
51 LockToCamBusy => Positioning to profile value
100 Init => Initialisation of template cam
Possible diagnostics?
The PLC program in the Servo PLC sporadically does not start if the memory area of the template variable g_byOperationState is accessed during the initialisation phase.
Short-term measures/recommendations?
None.
Evaluation:
Due to this function restriction, the PLC program does not start. The function restriction occurs only sporadically if several conditions are met at the same time (timing behaviour of the Servo PLC).
