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Program Controller SE-707
© 2018 by STANGE Elektronik GmbH
Subject to technical modifications
25
6.2.2 Turn-switch for PLC operating mode selection
A turn-switch for PLC operating mode selection of the internal PLC is located on the on the back of the device.
The turn-switch has positions from 0 to 9, only the first 4 positions are assigned:
Position 0: PLC takes “RUN” condition
Position 1: The PLC goes to “STOP”;
Position 2: The PLC makes a “RESET”;
Position 3: The PLC makes a “Memory-RESET”;
Positions 4 to 9 are not defined and should not be used!
ATTENTION!
The turn-switch should always remain in position 0!
All other positions have important effects to the operation and also possibly on the safety of the plant and might only be
used by experienced personnel of the plant manufacturer!
The turn-switch may only be turned very slow from one position to another. If the switch is turned too fast, then a
condition may be jumped over or not be recognized.
6.2.3 System Watchdog
6.2.3.1 General
The SE-707 device hardware has a hardware watchdog with an output as potential-free semi-conductor relay output lead
through at a device connector.
If the Watchdog output is really evaluated depends on the discretion of the plant manufacturer!
6.2.3.2 Mode of operation
The “Good” state of the Watchdog output is a closed contact. If the device is turned off or the Watchdog drops-out, then the
relay contact opens.
The contact of the Watchdog relay is typically used in an emergency stop chain. The Watchdog contact can alternatively be
used for the triggering of an alarm light, however the connecting signal must be inverted with the help of a coupling relay
(break contact
make-contact).
If the device Watchdog releases, a serious problem is existent, a normal operation of the plant is not given.
The Watchdog does not directly effect on the device, i.e., the control runs forward as far as it is possible.
If the Watchdog is dropped-out one-time, this state can only be removed by a hardware reset (i.e., power on/off).
Содержание SE-707
Страница 179: ...SE 7xx REFERENCE LISTS Function Inputs FI 2 ...
Страница 208: ...SE 7xx REFERENCE LISTS Function Outputs FO 2 ...