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Safety Inputs Section 5-2
5-2-2 Input Channel Mode Setting
The input channel mode of local safety inputs is set based on the type of
external device to be connected.
5-2-3 Test Source Setting
Select the test output terminal to use as the test source for the safety input
when the input channel mode is set to Test pulse from test output. If short cir-
cuit detection between input wiring lines is necessary, specify a different test
output terminal.
Examples:
Note With the NE1A-SCPU02, terminals T0 to T3 can be selected as the test
sources for IN0 to IN19. Terminals T4 to T7 can be selected as the test
sources for IN20 to IN39.
5-2-4 Input ON/OFF Delays
For the NE1A-series Controller’s local safety inputs, input ON/OFF delays can
be set in increments of multiples of the Controller’s cycle time between 0 and
126 ms. Setting a larger value helps to reduce influence from external device
chattering.
Channel Mode Description
Not used Input not connected to an external device.
Test pulse from test output Connects a contact output safety device with a test output. When this mode
is selected, select the test output terminal to use as the test source and set
the test output mode to Pulse Test Output. This enables detection of short
circuits with the power supply line (positive side), earth faults, and short cir-
cuits with other input signal lines.
Used as a safety input Used when connecting to safety devices with a semiconductor output, such
as a Light Curtain.
Used as a standard input Input connected to a standard (non-safety) device.
T0 T1
IN1IN0
11
21
12 22
IN1IN0
11 21
12 22
T0
Circuit in Which Short Circuit Detection
between Input Signals Is Required.
Circuit in Which Short Circuit Detection
between Input Signals Is Not Required.
T ON-delay T OFF-delay
Safety input,
e.g. limit switch
I/O tag
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