Festo FB16 Electronic Manual page 161

VIFB16 - 03/05
Fig. 5/15: Defining the diagnostic processing %TD for a field bus slave
0506b
5. Diagnosis/error treatment
With external errors, it is possible to trigger
diagnostic processing via %TD, providing this
was agreed when the valve terminal was defined
in the configuration editor (see diagram below).
As soon as an error is registered on the
FIPIO-bus, e.g. an external error from a valve
terminal, control light 9 and EXT FAULT of the
CPU5030 or CPU5130 will light up.
5-23