4 system program organisation units, Appendix – Lenze ECSCAxxx User Manual
Page 383
Appendix
System program organisation units
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383
EDBCSXA064 EN 3.2
14.4
System program organisation units
System POUs are program organisation units of the "program" type, which by means of a
specific designation adopt the feature of being started subject to an event occurring in the
ECSxA... axis module.
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The program includes max. 1000 instructions for system POUs.
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Unlike tasks or PLC_PRG, system POUs are not run−time monitored by a "watchdog".
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See the following table for special POU names and the related events for starting
the POU:
POU name
Event for starting POU
The POU starts if
PLC_TaskOverrun
Task overflow
... the task monitoring time is exceeded.
1)
PLC_RealError
Floating−point error
...a floating−point error occurs.
PLC_FailTripping
TRIP
...a trip is set.
PLC_WarningTripping
Warning
...a warning is activated.
PLC_MessageTripping
Message
...a message is indicated.
PLC_FailQspTripping
FAIL−QSP
...a FAIL−QSP is activated.
2)
PLC_CANError
CAN bus error
... a CAN bus error occurs (e.g. BUS−OFF).
3)
PLC_AIFError
AIF bus error
... an AIF bus error occurs.
3)
PLC_Restart
Start
... the START command is activated after a STOP.
PLC_ColdStart
Cold start
... a RESET, RESET (cold), RESET (original) or a program
download has been activated.
4)
Note: System variables must not be used in
PLC_ColdStart since this can lead to an unexpected
maloperation of the control system (e.g. restart of the
motor).
PLC_Stop
PLC stop
... the STOP command is activated.
5)
PLC_Undervoltage
LU threshold
... the set LU threshold is fallen below.
1)
The system variable "SYSTEM_bPLCResetAndRun"
does not execute a TRIP reset. Thus, an automatic
restart is not possible in this POU.
Procedure without mains switching:
PLC reset (C2108) => TRIP reset (C0043) => PLC start
(C2108)
2)
Is only called if pulse inhibit is not active.
3)
Only called if all monitoring functions of the
corresponding communication are deactivated.
4)
The CAN/AIF bus is ready after this POU has been
executed.
5)
This POU is not activated by Reset (cold, original).
I
Tip!
If you need a system POU for an event−controlled start, create a "program"
POU and use the name of this POU as POU name related to the corresponding
event listed in the table.