Input Dark Test Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

■Double input discrepancy detection time
Item
Double input discrepancy detection time Xn/Xn+1
(n: even number from 0 to A)
• A double input discrepancy error is detected in signals after the input response time has passed. 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 ON delay, input OFF delay time + double input discrepancy
detection time.
• Set the double input discrepancy detection time based on the following values: 100ms for mechanical
switches and 20ms for sensor inputs.

Input dark test function

This function outputs test pulses to turn off the external input signals (X0 to XB) that are on for a short time and diagnoses
contacts including external devices for failure.
When failure is detected, a minor error occurs. The module will recover from the error by eliminating its cause.
To use this function, settings of "Input mode setting" and "Input test pulse setting" are required.
The function detects internal circuit fixing, a short circuit caused by another safety input in one M12 connector as well as a
short circuit on 24G in the same M12 connector, on the condition that contacts of external devices are closed.
Test pulse
T0 T1
Safety remote I/O module
To use the input dark test function, use the test pulse output terminals (T0 to TB) and connect input devices.
To use the input dark test function, use the input terminals and test pulse output terminals (T0 to TB) of the safety remote I/O
module in the following combinations. An incorrect combination is regarded as a disconnection, and a minor error (input dark
test error) may occur.
The input dark test function can be used only when "Input mode setting" is set to "2: Input dark test execution".
Test pulse output terminal
T0
T1
T2
T3
T4
T5
The test pulse is output every 100ms, and the pulse width is fixed at 2ms.
NC
Test pulse
NC
X0 X1
Input terminal
X0
X1
X2
X3
X4
X5
100ms
Setting range
10 to 30000 (ms) (default value: 10)
Test pulse output terminal
T6
T7
T8
T9
TA
TB
ON
OFF
Input terminal
X6
X7
X8
X9
XA
XB
7 FUNCTIONS
7.3 Input Diagnostic Function
7
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