Signal Operation - Mitsubishi Electric MELFA CR750 Series Instruction Manual

3 Signals and wiring
3.1.2

Signal operation

DSI1/DSI2 signals are used to switch monitoring contents of the safety monitoring function. Each of the signals is
duplex and the state of two input signals need to match. If the state of two input signals does not match, an error
occurs.
Fig. 3-3 DSI1 operation
Input state
DSI1-A
(SKIP21-SKIP22) (MPI11-MPICOM1)
ON ON
OFF OFF
ON OFF
OFF ON
Fig. 3-4 DSI2 operation
Input state
DSI2-A
(SKIP31-SKIP32) (MPI14-MPICOM1)
ON ON
OFF OFF
ON OFF
OFF ON
3-12 Description of signals
DSI1-B
ON
OFF
Error H2221 occurs.
It is treated as ON in the
process.
Error H2221 occurs.
It is treated as OFF in the
process.
DSI2-B
ON
OFF
Error H2222 occurs.
It is treated as ON in the
process.
Error H2222 occurs.
It is treated as OFF in the
process.
DSI1 state
DSI2 state