Publication 1752-UM001A-EN-P - October 2006
Configure Local I/O 51
6. Set the Channel Mode for the safety input.
7. If you set the Channel Mode to Test pulse from test output,
choose the test output to use in combination with the safety
input by selecting it from the Test Source pull-down list.
8. Set the Dual Channel mode and Discrepancy Time.
Setting Dual Channel mode enables the status of two inputs to
be evaluated and reflected in I/O tags. The discrepancy time
between changes in the status of two inputs can also be
evaluated. The combinations that can be set are pre-defined.
The Discrepancy Time can be set between 0…65530 ms in
10 ms increments. Both inputs must change state within the
discrepancy time or an error occurs.
Input Channel Mode Settings
Channel Mode Description
Not used The input channel is not connected to an external device. This is
the default.
Test pulse from
test output
Use this mode when you are achieving a Category 4 input
circuit. This mode assumes that you have connected your input
device to a Pulse Test Source, and then wired to this input
terminal. This enables detection of short circuits with the power
supply line (positive side), earth faults, and short circuits with
other input signal lines (channel-to-channel shorts). The
controller must know that the input signal is being pulse-tested,
or nuisance trips may occur.
See the Example: Input Channel as Test Pulse from Test Output
on page 52.
Used as a safety
input
Use this mode to connect to a safety device with a
semiconductor output, such as a light curtain.
Used as a
standard input
Use this mode to connect to a standard (non-safety) device.
TIP
The Channel mode of the test output selected is
automatically set to Pulse Test Output.
Input Dual Channel Mode Settings
Channel Mode Description
Single Channel The safety input terminal is used independently.
Dual Channel Equivalent The safety input terminal is used as a Dual Channel
Equivalent with a pair safety input terminal.
Dual Channel
Complementary
The safety input terminal is used as a Dual Channel
Complement with a paired safety input terminal.
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