Siemens SIMATIC MV420, Operating Instructions Manual

Page: 288 / 424

Process interfacing via an automation system (PLC, PC)
10.4 Control with FB79
SIMATIC MV420 / SIMATIC MV440
286
Operating Instructions, 04/2013, A5E02371045-06
Job execution
Whether or not a job can execute successfully depends on the current status of the reader.
The following table shows which jobs are possible in the various statuses of the reader. You
will find the job number in the table of parameters.#
Reader status Job number = (hexadecimal)
0000 0001 0002 0003 0004 0005 0081 to 008F
RUN (RDY=1)
(processing mode
with output of the
result strings)
X X X X X X X
STOP X X X X X X -
ERROR
(IN_OP=0)
X X - X X X -
Sequence when canceling a job (COMMAND = W#16#0000)
Canceling a job is possible only with read jobs:
●
Read jobs (COMMAND = W#16#0081 to W#16#008F)
The block signals completion of the job cancel with ACTIVE = FALSE.
If a transfer is currently active when the job is canceled, this aborts and the error is reported
with an appropriate error message in the ERRCODE parameter. ERROR then has the value
TRUE and DONE the value FALSE. A transfer is active if DONE and ERROR have the value
FALSE.
If there is no transfer currently active when the job is canceled, on completion of the job, the
ERRCODE parameter has the value 0, ERROR the value FALSE and DONE the value
TRUE.
Sequence when changing jobs
If you want to change to a different job from a read job, the currently active job must be
canceled (see above).