Description:
Each connection requires connection resources for the end point or
for the transition point (e.g. CP) on the stations concerned. The
number of connection resources is CPU/CP-specific. The behavior
described above indicates a resources bottleneck. You might not
even be able to go online at all with your PG. Check the number of
existing communication connections. Does you CPU have sufficient
connection resources? The relevant information is available in the
manuals...
- Automation System S7-400 Module Specifications (Entry ID
1117740)
- CPU 31xC and CPU 31x, Technical Data (Entry ID:
12996906)
- SIMATIC PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2
DP (Entry ID 8860591).
Communication problems with OPs due to lack of connection
resources occurred in SIMATIC S7-300 usually with old CPUs, which
on the one hand had little connection resources and on the other
the connection resources could not yet be reserved for PG, OP and
S7 Basic communication. A table of the CPUs with which you can
reserve resources is included in Entry ID: 299124. Your problem
might well be cleared by reserving. Otherwise you should upgrade to
a new CPU firmware version.
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german
