Mitsubishi Electric NZ2GFSS2 32D S1 User Manual page 100

■Setting method
Set the double input discrepancy detection time in "Double input discrepancy detection time" from the "Parameter Processing
of Device Station" window of the engineering tool.
For the procedure to display the "Parameter Processing of Device Station" window, refer to the following.
Page 72 Parameter Settings
Item
Double input discrepancy detection time Xn, Xn+1
*1 n: 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
• A double input discrepancy error is detected in signals from which noise is filtered. Therefore, the time taken
from when actual signals are in the discrepancy state until when a double input discrepancy detection error
occurs is equal to the input response time + double input discrepancy detection time.
• The setting of "Double input discrepancy detection time" is valid only for the input signals to which "0:
Detect" is set in "Double input discrepancy detection setting" and "0: Discrepancy detection time specified"
is set in "Double input discrepancy detection type". For input signals with values other than the above set,
the value set for "Redundant input discrepancy detection time" will be ignored.
■Reference for the double input discrepancy detection time
Status
For mechanical switches and sensor inputs
When the synchronous time for double inputs can
be defined
When the synchronous time for double inputs
cannot be defined
8 FUNCTIONS
98
8.3 Input Diagnostic Function
Setting range
*1
1 to 6000 (10ms)
Set time
Set the time based on the following values: 100ms for mechanical switches and 20ms for sensor inputs.
For the input devices whose synchronous time specifications is open to the public, set the double input
discrepancy detection time considering the safety factor for the false detection.
Use the safety factor of 2 times or higher and set the double input discrepancy detection time to prevent
false detection depending on the input devices used.
For example, when the synchronous time is 1s, 2s shall be set as the double input discrepancy detection
time considering the safety factor of 2 times.
When the synchronous time cannot be defined for the application, such as usage of a door switches that
are opened or closed manually, set the maximum time or set "1: Do not detect" in "Double input
discrepancy detection setting". Even when "1: Do not detect" is set, the system stops when one of the
input signals turns off. Therefore, safety is ensured by inspecting the safety remote I/O module
periodically at a sufficiently short interval.