Allen-Bradley ProcessLogix 1756-IA16, Справочное руководство, Страница: 99 / 120

Publication 1757-RM810A-EN-P - May 2002
Functional Blocks 3-59
Sequential Control Module Blocks
HANDLER
Description SCM HANDLER blocks are execution modules that group STEP and TRANSITION blocks.
•
Multiple Handler blocks may be contained within an SCM block, each modeled as a set of STEP and TRANSITION
blocks, based on the following categories:
– Edit Handler
– Main Handler
– Check Handler
– Interrupt Handler
– Restart Handler
– Hold Handler
– Stop Handler
– Abort Handler
•
Choices of which HANDLER block of each category to invoke are manifested through a HANDLER block selection
list on the SCM block.
•
A HANDLER block is invoked when
– its invoke conditions, modeled in its Invoke TRANSITION block, are met
– when the SCM block is commanded to invoke the Handler (for example, the STOP command causes the STOP
Handler to execute).
Function Used to describe, group, and categorize sequential control behavior.
Parameters CONFIGCODE
CONFIGDESC
CONFIGSTS
EUDESC EXECCODE
EXECDESC
EXECSTS
HANDLER HIALM
INVOKT.HANDLE
NUM
ORDERINCM PROCESSED
PRODCODEA
STATE
TYPE
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