Mitsubishi Electric CC-Link IE-NZ2GNSS2-16DTE, User Manual

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8 FUNCTIONS
8.4 Safety Output
Diagnostic functions to detect output errors
Output errors can be detected by using the following diagnostic functions.
Combination of safety double outputs
Both terminals of double outputs are turned on only when both safety remote outputs (SA\Y) are on. The safety remote I/O
module evaluates the logic of safety remote outputs (SA\Y) and determines the state of the output terminals. The following
table lists the correspondence between each state of safety remote output (SA\Y) and output terminal for double outputs.
*1 m: Safety device address (even number of 0 to 6) assigned to the master station
*2 n: Even number of 0 to 6
Even if the double outputs do not match, the safety remote I/O module does not detect an error.
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States of safety remote outputs (SA\Y0, SA\Y1) for Y0 and Y1 (double wiring)
Diagnostic function Description Reference
Output dark test function Outputs test pulses to turn off the outputs that are on and diagnoses contacts
for failure.

Page 95 Output dark test
function
Output read-back function Reads back output results and diagnoses whether the external output signals
(Y0 to Y7) are correctly on or off.  Page 97 Output read-back
function
Safety remote output (SA\Y) Output terminal state Evaluation result of double outputs
SA\Ym
*1
SA\Ym+1
*1
Yn
*2
Yn+1
*2
OFF OFF OFF OFF OFF (Normal)
OFF ON OFF OFF OFF (Discrepancy)
ON OFF OFF OFF OFF (Discrepancy)
ON ON ON ON ON (Normal)
(1) When double outputs (source/source) are in the discrepancy state (safety remote outputs (SA\Y0 and SA\Y1) are different), Y0 and Y1 are off.
(2) When double outputs (source/source) are on (safety remote outputs (SA\Y0 and SA\Y1) are on), Y0 and Y1 are on.
(1) (1)
(2)
SA\Y0
SA\Y1
Discrepancy
state Discrepancy
state
Output
terminal: Y0
Output
terminal: Y1