Mitsubishi Electric NZ2GFSS2 32D S1 User Manual page 88

Single wiring function
This function can connect input devices with single wiring.
T0
• To satisfy SIL3, Category 4 and PL e, use the double wiring function.
• Systems using single wiring do not comply with SIL3 or Category 4 PL e, although the wiring can be used
for input using safety devices.
• When Xn (n: even number) is single wiring, Xn+1 cannot be set to double wiring. When Xn+1 is single
wiring, Xn cannot be set to double wiring. If a different value is selected and the parameter is set,
"Parameter data error (wiring selection of input): error code 0511H" occurs.
Diagnostic functions to detect input errors
Input errors can be detected by using the following diagnostic functions.
Diagnostic function
Double input discrepancy
detection function
Input dark test function
Combination of double inputs
The safety remote I/O module evaluates the logic of input signals and reflects the results to safety remote inputs (SA\X).
When the double input signals differ, the double input discrepancy detection state is applied. The following table lists the
correspondence between each double input signal state and safety remote input (SA\X).
Input terminal state
*1
Xn
OFF
OFF
ON
ON
*1 n: Even number
*2 m: Safety device address (even number from 0 to 1E for the NZ2GFSS2-32D-S1 or from 0 to 6 for the NZ2GFSS2-8D-S1 and the
NZ2GFSS2-16DTE-S1) assigned to the master station
8 FUNCTIONS
86
8.1 Safety Input Function
X0
Safety remote I/O module
Description
Detects the discrepancy of double input signals.
Outputs test pulses to turn off the inputs that are on and diagnoses contacts
including external devices for failure.
Safety remote input
*1
Xn+1 SA\Xm
OFF OFF
ON OFF
OFF OFF
ON ON
*2
SA\Xm+1
OFF
OFF
OFF
ON
Reference
Page 93 Double input discrepancy
detection function
Page 101 Input dark test function
Evaluation result of double inputs
*2
OFF (Normal)
OFF (Discrepancy)
OFF (Discrepancy)
ON (Normal)