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11-1
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Changing IM 151-7 CPU (6ES7 151-7Ax00..)
to IM 151-7 CPU (6ES7 151-7AA10-0AB0)
If you download your existing user program for the IM 151-7 CPU
(6ES7 151-7Ax00-0AB0) to an IM 151-7 CPU (6ES7 151-7AA10-0AB0), you may
encounter the following problems:
The SFC 56, SFC 57 and SFC 13 may work asynchronously
A number of asynchronous SFCs are always processed or, under certain
conditions, already processed following the first call (”quasi-synchronous”) on the
IM 151-7 CPUs (6ES7 151-7Ax00-0AB0).
These SFCs actually run asynchronously on the IM 151-7 CPUs
(6ES7 151-7AA10-0AB0). The asynchronous processing may continue for several
OB 1 cycles. As a result, a queue within an OB may become a continuous loop.
SFC 56 ”WR_DPARM”; SFC 57 ”PARM_MOD”
This SFCs always function ”quasi-synchronously” on stand-alone
IM 151-7 CPUs (6ES7 151-7Ax00-0AB0).
They function asynchronously on stand-alone IM 151-7 CPUs
(6ES7 151-7AA10-0AB0) and distributed IM 151-7 CPUs.
Note
If you use the SFC 56 ”WR_DPARM” or SFC 57 ”PARM_MOD”, you should
always evaluate the BUSY bit of the SFCs.
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