Siemens SIMATIC MV440 Operating Instructions Manual page 333

Adding program change
Specify the number of the required program in memory byte MB200. The program change
runs automatically. The correct order of the commands is adhered to. The FB changes to the
program specified at PARAM1.
Avoiding undefined plant states
To avoid undefined plant states, you should only change programs when the plant is in
manual mode or is not in operation.
Startup OB OB100
In OB100, you set the RESET input of FB79 to initialize the FB. This input is reset again by
calling FB79.
Bits of the control and status bytes used
The following control and status bits need to be processed in your program in addition to the
FB79 call:
Bit no.
Q x.6
Q x.7
I x.0
I x.2
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
CAUTION
in Corresponds to
signal
Control byte TRG
Control byte RES
Status byte IN_OP
Status byte RDY
Process interfacing via an automation system (PLC, PC)
Function
Processing starts on a positive edge.
Reset sensor error
0: error or startup,
1: Sensor is functional
1: Sensor is in RUN, in other words ready to process
codes.
You can use this signal to enable the feed of work
pieces.
10.9 Sample programs
331