Lenze ECS series User Manual

Appendix
System program organisation units
14
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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.
ƒ The program includes max. 1000 instructions for system POUs.
ƒ Unlike tasks or PLC_PRG, system POUs are not run−time monitored by a "watchdog".
ƒ 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).
 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.

Lenze ECS series Specifications

General

Brand	Lenze
Model	ECS series
Category	Control Unit
Language	English