Siemens SIMATIC MV500, Operating Instructions Manual, Page: 192 / 294

Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
SIMATIC MV500
192
Operating Instructions, 03/2021, C79000-G8976-C494-05
When the job is triggered, the parameters "DONE" and "ERROR" have the value "FALSE". The
"ACTIVE" parameter has the value "TRUE". The block saves the program specified at the
"PARAM1" parameter.
Note
Notes on saving
Note the following points when saving:
•
In isolated cases, saving a program can take up to 35 s.
• The value of "PARAM1" must not be changed before the job is completed.
It then queries the program now selected on the optical reader and outputs it at the
"CODE_OUT" parameter.
If the program now selected matches the program specified at the "PARAM1" parameter, the
"ACTIVE" parameter has the value "FALSE" and the "DONE" parameter the value "TRUE". If the
program now selected does not match the program specified at the "PARAM1" parameter, the
"ACTIVE" parameter has the value "FALSE" and the "ERROR" parameter the value "TRUE". The
"ERRCODE" parameter contains an appropriate error message. The system also checks
whether program saving is being blocked by a "Service" or "User1" user logged on in the WBM
who has taken over control of the optical reader, and whether the program was saved
successfully.
If an error is detected, the "ACTIVE" parameter has the value "FALSE" and the "ERROR"
parameter has the value "TRUE". The "ERRCODE" parameter contains an appropriate error
message.
If you attempt to cancel a current save program job, the "ERRCODE" parameter will change to
"DW#16#00000002"; however, processing for the job will be completed.
Sequence when outputting the currently selected program ("COMMAND" = W#16#0003)
When the job is triggered, the parameters "DONE" and "ERROR" have the value "FALSE". The
"ACTIVE" parameter has the value "TRUE".
The block then queries the program now selected on the optical reader and outputs this
program at the "CODE_OUT" parameter.
If no error occurs in the transfer of the program number, the "ACTIVE" parameter will have
the value "FALSE" and the "DONE" parameter the value "TRUE".
Sequence when outputting the operating state of the optical reader ("COMMAND = W#16#0004")
Based on the status byte of the optical reader, the block recognizes the current state and
outputs this in the "STATE" parameter. Note the following points:
•
If the "IN_OP" bit is not set, status 3 ("ERROR") is output.
• If the "IN_OP" bit is set but not the "RDY" bit, status 2 ("STOP") is output.
• If the "IN_OP" bit and the "RDY" bit are set, status 1 ("RUN") is output.