Mitsubishi Electric MELSEC iQ-RX40NC6B Application User's Manual page 163

Double input combination
The input module with diagnostic functions evaluates an input signal's logic and reflects the result in the relevant safety input
(SA\X). When double inputs are made with different signals, a double input discrepancy detection state arises. The following
table shows the correspondences between double input signal statuses and safety inputs (SA\X).
Input terminal status
X in the RX40NC6B (Main) X in the RX40NC6B (Sub)
OFF
OFF
ON
ON
■Status of safety input SA\X0, with double wiring applied to X00 in the RX40NC6B (Main) and
X00 in the RX40NC6B (Sub)
Input terminal state of the
RX40NC6B (Main): X00
Input terminal state of the
RX40NC6B (Sub): X00
SA\X0
(1)
(1) Even when X00 in the RX40NC6B (Main) becomes ON, because X00 in the RX40NC6B (Sub) is OFF, ON is not reflected in SA\X0.
(2) When double wiring is ON (X00 in the RX40NC6B (Main) and X00 in the RX40NC6B (Sub) are both ON), SA\X0 becomes ON.
Setting procedure
With "Wiring input selection", set the terminal to perform double wiring on.
[Navigation window]  [Parameter]  [Module Information]  Model  [Module Parameter]  [Basic setting]  "Wiring
input selection"
• When "Not used" is selected for "Wiring input selection", input data is always OFF.
• For an unused input terminal, set "Not used" for "Wiring input selection".
OFF
ON
OFF
ON
Double input discrepancy
detection state
(2)
Safety input (SA\X)
OFF
OFF
OFF
ON
Double input evaluation result
OFF (Normal)
OFF (Mismatch)
OFF (Mismatch)
ON (Normal)
10 FUNCTIONS
10.2 Safety Input Function
10
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