Connection Resources For Cpus 312Ifm To 316-2 Dp - Siemens SIMATIC S7-300 Series Reference Manual
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CPUs
Connection Resources for CPUs 312IFM to 316-2 DP
Communication resources are independent of the interface in CPUs 315-2 DP and
316-2 DP. That is, a PG communication occupies a connection resource,
regardless of whether the connection was established via MPI or DP interface.
Table 1-7
Connection Resources for CPUs 312 IFM to 316-2 DP
Communication Function
PD communication/
OP communication
OP communication
S7 basic communication
S7 communication
Routing of PG functions
(CPU 31x-2 DP)
Communication via a CP
343-1 with data lengths >240
bytes for Send/Receive
1-14
In order to make the allocation of connection resources dependent not
only on the chronological sequence in which various communication
services are registered, connection resources can be reserved for the
following services:
S
PD communication and OP communication
S
S7 basic communication
For PD/OP communication, at least one connection resource is reserved
as the default setting. Lower values are not possible.
The technical specifications of the CPUs detail the possible connection
resources settings and the default settings in each case. In STEP 7 you
specify a "redistribution" of communication resources when you configure
the CPU.
Other communication services such as S7 communication using
PUT/GET functions can not use these communication resources even if
they establish their connection at an earlier time. Instead, the remaining
available connection resources that have not been specifically reserved
for a particular service are used.
Example based on CPU 314 which has 12 connection resources
available:
- You reserve 2 connection resources for PD communication
- You reserve 6 connection resources for OP communication
- You reserve 1 connection resource for S7 basic communication
³ In this case, you still have three communication resources available
for S7 communication, PG/OP communication and S7 basic
communication.
Note on OP Communication Resources: When using more than three
OPs, error messages might occur due to temporary lack of resources in
the CPU. Examples of such error messages are "44 Transmission error
#13" or "#368 S7 communication error class 131 No. 4".
Remedy: Acknowledge error messages manually or after a time delay
configured in PROTOOL (in "System Messages" →→ "Display time").
The CPUs provide connection resources for four routed connections.
Those connection resources are available in addition.
The CP requires a free connection resource that is not reserved for
PD/OP/S7 basic communication.
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
Description
A5E00111190-01
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