10 FUNCTIONS
10.4 Input Diagnostic Function
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Guidelines on double input discrepancy detection time
Double input discrepancy auto recovery function
When a double input discrepancy detection error occurs and the cause of that error is eliminated, this function can
automatically restore the normal state. By enabling this function, it is possible to make the reset operation for the input module
with diagnostic functions that aims to reset an error no longer necessary. When this function is enabled, if a double input
discrepancy is detected, a double input discrepancy detection error (error code: 1400H) will occur.
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Auto recovery timing
To release a double input discrepancy detection error, actual input signals on both sides need to be turned OFF. The following
shows a timing in which a double input discrepancy detection error is automatically recovered.
Condition
Guidelines on double input discrepancy detection time
For a mechanical switch
Set the time around 100ms.
For a sensor input
Set the time around 20ms.
When double input synchronization time can be defined
For input equipment with specifications for synchronization time open to the
public, set a value determined by considering the safety factor for
misdetections. In addition, with 200% or larger safety factor in mind, set a
value that prevents misdetections according to the input device.
Example:When the synchronization time is 1s, with 200% safety factor, set the
double input discrepancy detection time to 2s.
When double input synchronization time cannot be defined
For a device such as a door switch that manually opens and closes the door,
when synchronization time cannot be defined, set the maximum time or set
"Redundant input discrepancy detection settings" to "Disabled". Even if
"Disabled" is set, when an input signal on one side becomes OFF, the system
itself stops. Therefore, safety can be assured by periodically inspecting the
input module with diagnostic functions at sufficiently short intervals.
For performing the input dark test function
For double input discrepancy detection time, set the sufficiently longer time
than the input dark test pulse OFF time of the input dark test function. If not, a
test pulse (OFF pulse) for the input dark test function may be mistakingly
detected as double input discrepancy.
(1) SA\X0 becomes OFF when a discrepancy is detected.
(2) A double input discrepancy detection error (error code: 1400H) occurs.
(3) Even when both X00 in the RX40NC6B (Main) and X00 in the RX40NC6B (Sub) become ON, auto recovery is not performed.
(4) When both X00 in the RX40NC6B (Main) and X00 in the RX40NC6B (Sub) become OFF, auto recovery is performed.
(5) No discrepancy
(6) Discrepancy occurred
(1)
(2)
(3)
(4)
(5)
(6)
(5)
SA\X0
Double input
discrepancy
detection time
Double input discrepancy auto
recovery enabled signal
(Un\G1032)
Actual terminal input
Double input discrepancy detection
state X00 (in the module)
X00 of the RX40NC6B
(Main)
X00 of the RX40NC6B
(Sub)
Содержание MELSEC iQ-RX40NC6B
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