Process interfacing via an automation system (PLC, PC)
10.5 Controlling the I/O interface "DI/DO"
SIMATIC MV420 / SIMATIC MV440
294 Operating Instructions, 04/2013, A5E02371045-06
10.5 Controlling the I/O interface "DI/DO"
10.5.1 Control signals
Note
Control via DI/DO can only be used as selected in the parameter settings in the user
interface in "Connections ➜ Digital I/O".
Input signals
Name Function
DISA Disable: Disables manual keyboard input, program selection and program saving
via digital I/O, error acknowledgment, starting the reader.
SEL0 Select 0: Program selection bit 0
SEL1 Select 1: Program selection bit 1 (when TRN=0) / Save program (when TRN=1)
SEL2 Select 2: Program selection bit 2
SEL3 Select 3: Program selection bit 3
TRN Train: Saves new program
TRG Trigger: Processing starts on a positive edge.
RES Reset: Reset error.
Note
The SEL0, SEL1, SEL2, SEL3, and TRN signals are effective only when DISA=1.
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