Festo CTEU-CO, Manual, Functions And Maintenance

Page: 31 / 80

1. Commissioning
1-17
Festo P.BE-CTEU-CO-OP+MAINT-EN en 1101NH
Example 5: Start “Node guarding” monitoring
Load first the indices 100C and 100D via SDO transfer (see
example 3). The “Node guarding” monitoring of the bus node
starts when the first “Node guarding” telegram is received.
This telegram must be cyclically repeated within the timeout
time:
Timeout time = guard time
·
life time factor
= Index 100C
·
index 100D
If this time is exceeded, the valves/outputs will be switched
off or they will assume the “Fail state” status.
Note
The timeout monitoring in the bus node is inactive until the
first “Node guarding” telegram is received: Outputs that
have been set (e.g. switched valves) remain set even after
a loss of communication, fieldbus interruptions, et c.
05
701
701 :
PLC/PC/IPC
COB
-I
D
Bi
t
7
=
to
ggl
e
b
it
(all values in hex)
COB
-I
D
Node guarding response
Da
ta
*)
Fig. 1/7: Example 5, start “Node guarding” monitoring (
*)
Remote request)