Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 19)

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 19
Overview Chapter 1
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.