Reaction To Network Communication Faults; Node Guarding - Festo CTEU-CO Manual, Functions And Maintenance

2. Diagnosis

2.3.3 Reaction to network communication faults

2.3.4 Node guarding

Festo P.BE-CTEU-CO-OP+MAINT-EN en 1101NH
Note
Please observe the following if the outputs are reset in the
event of a PLC stop or field bus interruption or
malfunction:
– Single-solenoid valves move to the basic position.
– Double-solenoid valves remain in the current position.
– Mid-position valves move to the mid position (depending
on the valve type: pressurised, exhausted or blocked).
You can parameterise the behaviour of connected devices in
the event of a fault. All valves/outputs of connected devices
are reset as standard when the following faults and operating
states occur as soon as Node guarding or Heartbeat are activ-
ated via the configuration:
– Communication error (Node guarding, Heartbeat)
– Transition from operational to pre-operational or stopped
The behaviour of connected devices in the event of commu-
nication errors can be changed using the corresponding DIL
switches (see section 1.7).
In order for CANopen to recognise a fieldbus failure Node
guarding must be activated on the master controller (default:
switched off ).
In the case of actuators it is advisable to monitor the master
controller for failure in order to provide an appropriate emer-
gency shutdown strategy.
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