ProSoft Technology ProLinx PDPM, Руководство по протоколу

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PDPM Protocol Configuration PDPM ♦ ProLinx Gateway
Protocol Manual PROFIBUS DP Master
Page 46 of 70 ProSoft Technology, Inc.
June 24, 2013
4.2.3 254 - Read Cntrs
If the Data Length parameter is set to zero, the command will reset the counters
for all slaves. If the Data Length is specified, it represents the number of slaves
to read the static counter data. The Node Address specifies the first slave node
to consider in the request. The counter data returned is placed at the Database
Address in the command.
4.2.4 Command 70 Control Byte
The Freeze and Sync commands are used for synchronization purposes. The
Freeze command causes a slave to freeze its inputs and the Sync command
causes a slave to hold the outputs.
Bit Definition
0 Reserved
1 Clear output data
2 Unfreeze input data
3 Freeze input data
4 Neutralize the sync command
5 Freeze output data until sync command is neutralized
6 Reserved
7 Reserved
Bit 2 or 4 Bit 3 or 5 Definition
0 0 No function
0 1 Function will be activated (that is, Freeze input data)
1 0 Function will be inactivated (that is, Unfreeze input data)
1 1 Function will be inactivated (that is, Unfreeze input data)