SmartGuard 600 Controllers
13
Publication 1752-IN001C-EN-P - January 2009
Wiring Input Devices
Input devices with mechanical contact outputs, such as emergency stop buttons
and safety limit switches, use both a safety input terminal and a test output
terminal. This enables the circuit to reach a Category 4 rating.
When safety devices are connected via test outputs to an input circuit on the
SmartGuard controller, we recommend the length of the wire to be 30 m (98.4 ft) or
less.
Input Devices with Mechanical Contact Outputs
WARNING
If you connect or disconnect the removable terminal block (RTB) while the field-side
power is applied, an electrical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area is nonhazardous before
proceeding.
IMPORTANT
Prepare stranded wires by attaching ferrules with plastic insulation covers (compliant
with the DIN 46228-4 standard). Ferrules similar in appearance but not compliant may not
match the terminal block on the controller.
ATTENTION
Applying an inappropriate DC or any AC voltage may result in a loss of safety function,
product damage, or serious injury. Properly apply only the specified voltage to controller
inputs.
SmartGuard 600
Controller
V1
Tx
INx
G1
24V DC
4.5 mA Typical
