Wago 750-333 PROFIBUS DP/V1 FIELD BUSCOUPLER 12 MBaud 750-333 Datenbogen

82  •

2001-02-27

The operating mode switch is located behind the cover flap.

Fig. 3-18: Operating mode switch

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The switch is a push/slide switch with 3 settings and a hold-to-run function.

From middle to top position

Activate program processing (RUN)

From top to middle position

Stop program processing (STOP)

(Lower position, bootstrap)

(For original loading of firmware,
not necessary for user)

Push down
(e.g with a screwdriver)

Hardware reset
All outputs and flags are reset; variables are set to 0 or to
FALSE or to an initial value.

The hardware reset can be performed with STOP as well
as RUN in any position of the operating mode switch!

Attention
If outputs are set when switching over the operating mode switch from RUN
to STOP they remain set! Switching off on the software side e.g. by initiators,
are ineffective, because the program is no longer processed.

(An operating mode is internally changed at the end of a PLC cycle.)

Note
With "GET_STOP_VALUE" (library "System.lib") WAGO-I/O-PRO 32 pro-
vides a function which serves to recognise the last cycle prior to a program
stop giving the user the possibility to program the behaviour of the controller
in case of a STOP. With the aid of this function the controller outputs can be
switched to a safe condition.