Assignment Of The Gcgr Parameter - Siemens SIMATIC S5 Manual

Assignment of the The FB IM308C does not read the GCGR parameter unless a control
GCGR parameter command is sent with FCT = GC or CC. You define the group memberships
of the DP slaves with COM ET 200 Windows.
If FREEZE and UNFREEZE are set simultaneously, only UNFREEZE is
executed. The same applies to simultaneous SYNC and UNSYNC.
Note
"00" is not permissible as the group selection byte.
Table 9-18 Assignment of the GCGR parameter
Bit
15
14
13
12
11
10
9
8
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
IM 308-C – addressing, diagnostics and use of the FB IM308C
GCGR parameter
Global Control
(control command)
Bit 15 Bit 8
Meaning of control command
(Global Control)
Reserved
Reserved
1: SYNC is executed.
0: No meaning
1: UNSYNC is executed.
0: No meaning
1: FREEZE is executed.
0: No meaning
1: UNFREEZE is executed.
0: No meaning
Reserved
Reserved
Group selection
Bit 7 Bit 0
Bit
(group selection)
7 1: Group 8 selected.
6 1: Group 7 selected.
5 1: Group 6 selected.
4 1: Group 5 selected.
3 1: Group 4 selected.
2 1: Group 3 selected.
1 1: Group 2 selected.
0 1: Group 1 selected.
Meaning
9-31
9