Omron CJ1W-PRT21, Руководство по эксплуатации

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3 Data Exchange with the CPU Unit
3-6
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
3-4 PROFIBUS Startup Data
The mapping of PROFIBUS I/O data to the host CPU is controlled by the Set_Prm (set parameter) and
Chk_Cfg (check configuration) telegrams sent by the PROFIBUS Master. At startup of the PROFIBUS
communication the following commands are sent
 Set_Prm
At system startup, after a restart and in data exchange mode the Set_Prm telegram will provide the
following information:
• Start address of the area in the host CPU where to read and to send to the master.
• Format (Motorola/Intel) of the data to be sent to the master.
• Actions to be taken in case of CPU status change or fatal errors.
• Inclusion of 2 words CPU status information or not.
 Chk_Cfg
The Chk_Cfg telegram will provide the number of words to be read from the host CPU and to be
sent to the Master plus the number of words to be received from the Master and to be written to the
host CPU.
Master Slave
Slave diagnos
tic
Not OK
Set_Prm
Chk_Cfg
Slave diagnos
tic
OK
Data
Data
Data
Data