A.1.2 changed behavior of certain sfcs – Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 User Manual
Page 208
Appendix
A.1 Information about upgrading to a CPU 31xC or CPU 31x
CPU 31xC and CPU 31x, Technical data
A-2
Manual, Edition 08/2004, A5E00105475-05
... then please note if you upgrade to one of the following CPUs
From version
CPU
Order number
Firmware
Hardware
Hereafter called
312
6ES7312-1AD10-0AB0
V2.0.0
01
312C
6ES7312-5BD01-0AB0
V2.0.0
01
313C
6ES7313-5BE01-0AB0
V2.0.0
01
313C-2 PtP
6ES7313-6BE01-0AB0
V2.0.0
01
313C-2 DP
6ES7313-6CE01-0AB0
V2.0.0
01
314
6ES7314-1AF10-0AB0
V2.0.0
01
314C-2 PtP
6ES7314-6BF01-0AB0
V2.0.0
01
314C-2 DP
6ES7314-6CF01-0AB0
V2.0.0
01
315-2 DP
6ES7315-2AG10-0AB0
V2.0.0
01
315-2 PN/DP
6ES7315-2EG10-0AB0
V2.3.0
01
317-2 DP
6ES7317-2AJ10-0AB0
V2.1.0
01
317-2 PN/DP
6ES7317-2EJ10-0AB0
V2.3.0
01
CPU 31xC/31x
Reference
If you intend to migrate from PROFIBUS DP to PROFINET, we also recommend the
following manual:
Guide: From PROFIBUS DP to PROFINET IO
See also
A.1.2
Changed behavior of certain SFCs
SFC 56, SFC 57 and SFC 13 which work asynchronously
Some of the SFCs that work asynchronously, when used on CPUs 312IFM – 318-2 DP, were
always, or under certain conditions, processed after the first call ("quasi-synchronous").
On the 31xC/31x CPUs these SFCs actually run asynchronously. Asynchronous processing
may cover multiple OB1 cycles. As a result, a wait loop may turn into an endless loop within
an OB.
The following SFCs are affected:
•
SFC 56 "WR_DPARM"; SFC 57 "PARM_MOD"
On CPUs 312 IFM to 318-2 DP, these SFCs always work "quasi-synchronously" during
communication with centralized I/O modules and always work synchronously during
communication with distributed I/O modules.