Modus Plus communication: General
The MSTR function block is used to read or write internal words of a Premium or
Micro station. The parameter of the slave register of the MSTR function block directly indicates the address of the internal word %MW of the PL7 application. This function block is also used to read or reset the statistics counters of a Premium or
Micro station. This request is executed directly by the PCMCIA card which responds directly.
TLX DS COM PL7 xxE
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Modus Plus communication: General
190
TLX DS COM PL7 xxE
Peer Cop service
13
Peer Cop service
Introduction
Specific inputs and outputs
Report
The Peer Cop service is an automatic exchange mechanism between stations connected to the same local Modbus Plus segment.
This service is used to maintain constant control over inputs / outputs which have been remoted by implicit exchanges.
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The TSX Premium PLCs support two types of Peer Cop transfer.
specific inputs, specific outputs.
The specific inputs and outputs are point to point services which use the multicast protocol (multistations). Each message contains one or several destination addresses for sending the data. This function is used to exchange data to several stations without repetition.
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Three types of report are associated with the specific inputs and outputs: activity bit: provides information on the availability and validity of the status bits, status bits (to the number of one bit per station): l ensure coherence between the number of specific inputs configured and the l l number of specific inputs received, indicate if the specific inputs have been received during the Timeout, presence bits (to the number of one bit per station): indicate if the specific inputs have been refreshed.
Note: The presence bits are only valid for the specific inputs.
191
TLX DS COM PL7 xxE
Communication Modbus Plus: Peer Cop service
Example for the inputs
The data blocks are copied in full from the PCMCIA card to the internal word space, reserved during configuration.
Max. 500 characters
In the following example, the address of the first internal word is %MW10:
Internal words PCMCIA card Modbus Plus network
%MW10
3 words from station 1
%MW13
32 words from station 5
%MW45
20 words from station 6
%MW65
12 words from station 8
%MW77
32 words from station 9 copy
Peer Cop data specific inputs
Station 1
Station 5
Station 6
Station 62
%MW150
3 words from station 62
Activity bit
%IW0.1.6
%IW0.1.7
...
%IW0.1.14
copy
Status bits
Presence bits
192
TLX DS COM PL7 xxE
