Publication 1752-UM001A-EN-P - October 2006
Overview 15
Safety Inputs
The controller has 16 local safety inputs, which support the features
described below.
• Input circuit diagnosis — Test pulse sources can be used to
monitor internal circuits, external devices, and external wiring.
• Input on- and off-delays — You can set input time filters of
0…126 ms in multiples of the controller cycle time. Setting input
on- and off-delays helps reduce the influence of chattering and
external noise.
• Dual Channel mode — You can set Dual Channel mode for pairs
of related local inputs. When Dual Channel mode is set, time
discrepancies in changes in data or input signals between two
paired, local inputs can be evaluated.
Safety Outputs
The controller has eight local safety outputs, which support the
features described below.
• Output circuit diagnosis — Test pulses can be used to diagnose
the controller’s internal circuits, external devices, and external
wiring.
• Overcurrent detection and protection — To protect the circuit,
an output is blocked when an overcurrent is detected.
• Dual Channel mode — Both of two paired outputs can be set
into a safety state without depending on the user program when
an error occurs in either of the two paired local outputs.
Test Pulse Sources
Four independent test outputs are normally used in combination with
safety inputs. They can also be set for use as standard signal output
terminals. The test pulse outputs support the following features.
• Overcurrent detection and protection — To protect the circuit,
an output is blocked when an overcurrent is detected.
• Current monitoring for muting lamp — Disconnection can be
detected for the T3 terminal only.
Communications
The controller can act as a DeviceNet safety master or slave, as a
DeviceNet standard slave, or as a standalone controller when
DeviceNet communications are disabled. A single controller can
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