PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke
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4.9.2.5. Service 5: freeze/unfreeze DP slave inputs<br />
This service allows you to read and freeze or unfreeze the<br />
input states of specific DP slaves, groups (multicast) or all<br />
of the DP slaves in the network (broadcast).<br />
The Freeze service causes the DP slave to freeze the input<br />
values that were read last. Changes of the input states are<br />
no longer registered. This procedure can be repeated any<br />
number of times. The current input values are read and<br />
frozen every time this service is called for.<br />
The Unfreeze service has the opposite effect: inputs values<br />
are cyclically read and the process image is updated as<br />
usual.<br />
Parameter field<br />
Byte<br />
Parameter<br />
0<br />
B yte 1 Error#<br />
Input<br />
Descriptio n<br />
Service<br />
5 Specifies the service<br />
0 No error<br />
1 Parameter error<br />
2 Service not possible<br />
7 Internal error<br />
0...99<br />
Number of DP slave<br />
B yte 2 Station#<br />
127<br />
Global address, broadcas t<br />
B yte 3 Group#<br />
( 0)1... 8 Group-Ident (0=none)<br />
Byte<br />
4<br />
Action<br />
0...127<br />
Unfreeze; bit 7 = 0<br />
128...255<br />
Freeze; bit 7 = 1<br />
Station<br />
Specify the station and group numbers of the DP slave(s)<br />
that the service is to apply to.<br />
For further details please refer to chapter "4.9.2.3.1.<br />
Choosing a station and group".<br />
4 - 54
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