Diagnostic Byte; Festo - Festo VIFB-02- Series Manual

VIFB1 - 02

Diagnostic byte

Diagnostic
information
V (V )
valve val
V (V )
output out
V (V )
input inp
SA0
SA1
Fig. 6/5: Error status of valve terminal/valve sensor terminal
> IFB1-02_BES_V_018474g1_1996-04N - Restored Document - 2011-12-15 <
9604
6. Diagnostic/error treatment
The diagnostic information on a valve termi-
nal/valve sensor terminal is gathered together in
the form of a diagnostic byte (status byte). With
this diagnostic byte the following error states can
be recognized and the PLC informed accordin-
gly.
Meaning
Monitors the operating
voltage of valves and
additional outputs
Monitors the operating
voltage of the valves and
additional outputs (no
voltage), e.g. EMERGENCY
OFF).
Monitors the operating
voltage of the inputs with
valve sensor terminals
Monitors additional output
O0.00 of valve sensor
terminal
Monitors additional output
O0.01 of valve sensor
terminal
The diagnostic byte is transmitted to the PLC, in
accordance with the relevant field bus protocol.
Depending on the manufacturer, the following in-
formation must be observed.

Festo

All diagnostic information on the valve termi-
nal/valve sensor terminal can be evaluated with
the FPC 405. An error list is then compiled in the
field bus module E.CFA. All status bytes are inc-
luded in this list and continually updated.
Cause
Operating voltage at pin 2 of
operating voltage
connection< 21.6 V
Operating voltage at pin 2 of
operating voltage
connection < 10 V
E.g. fuse triggered
Short circuit or overload
Short circuit or overload
6-7