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Parallel Operation of Two Serial PG Interfaces
11 - 20
The table below lists the pairs of functions that you cannot work with
simultaneously.
Table 11-2
Functions which cannot run simultaneously on both PGs
Function active
on the first PG:
"Force"
"Program test"
A "status" function"
A "status" function"
A "status" function"
"Status" on long running blocks
or blocks which are not processed
If you attempt to start one of the illegal functions, the second PG
displays an error message, e.g.: "AS function disabled: function
active".
The same error message or "Overflow in data exchange with PG"
appears if the CPU 948 is currently processing functions of the other
PG, which prevent your PG accessing the CPU within the monitoring
time. Your input is then rejected. Repeat your input once the functions
are completed on the other PG.
Note
Owing to the different performances and range of functions, time
monitoring and the response to errors is not identical in all PGs
and OPs.
If you activate the function "memory configuration"
simultaneously on both PGs, the displays may be incorrect.
Caution
If you input, correct or delete blocks online on both PGs
simultaneously, you must make sure that the blocks are not
protected by the other PG before you access them.
"Status" of a block which is not processed or "status" in the STOP
mode blocks the other interface for all functions.
You must not activate this
function on the second PG
Any function
Any function
"Force"
"Program test"
"Overall reset"
Any function
CPU 948 Programming Guide
C79000-G8576-C848-04
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