8 FUNCTIONS
8.3 Input Diagnostic Function
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8.3 Input Diagnostic Function
Double input discrepancy detection function
This function discriminates failures by monitoring the discrepancy state of doubled safety remote inputs (SA\X).
Double input discrepancy detection
■Double input discrepancy detection (with discrepancy detection time specified)
If "Double input discrepancy detection setting" is set to "0: Detect" and "Double input discrepancy detection type" is set to "0:
Discrepancy detection time specified" from the "Parameter Processing of Device Station" window, a double input discrepancy
detection error is generated as an input error when the discrepancy state of double inputs continues for the set time or longer.
For the double input discrepancy detection time, refer to the following.
Page 97 Double input discrepancy detection time
The following figure shows the operation details of the double input discrepancy detection (with discrepancy detection time
specified) for double wiring inputs X0 and X1.
■Operation at error detection (with discrepancy detection time specified)
When the discrepancy state of double inputs continues for the set time or longer, the error (double input discrepancy detection
error) state is applied to the safety remote I/O module. For the error state, refer to the following.
Page 138 Error codes related to the safety remote I/O module
The corresponding input points are turned off when the discrepancy state of inputs occurs.
For the NZ2GFSS2-8D-S1 or NZ2GFSS2-16DTE-S1, when an error occurs for all the input points due to the
input dark test error or double input discrepancy detection error and the input function cannot be performed
anymore, an error state of I/O data error (010BH) is applied. However, when a minor error of double input
discrepancy detection error occurs while "1: Use" is set for the parameter "Double input discrepancy auto
recovery setting", the input function may be recovered. Thus, an error of I/O data error (error code 010BH)
does not occur even though the error occurs for all the input points.
(1) After the double input discrepancy detection time elapses, a double input discrepancy detection error occurs.
(1)
SA\X0
SA\X1
Double input discrepancy
detection time
Both OFF
Input terminal status: X0
Error status flag
Input terminal status: X1
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