Fieldbus Controller 750-841 • 43
Hardware
3.1.2.6 Operating Mode Switch
The operating mode switch is located behind a cover flap.
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RUN |
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STOP |
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RESET |
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(pushing down) |
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UPDATE FIRMWARE |
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Mode switch |
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Fig. 3-4: Operating Mode Switch |
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g01xx10e |
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The switch is a push/slide switch with 3 settings and a hold-to-run function.
The slide switch is designed for a maximum number of switching cycles as defined in EN61131T2.
Operating mode switch |
Function |
From middle to top position |
Firmware and PFC application are executed (Activate |
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program processing (RUN) |
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From top to middle position |
Firmware is executed, PFC application is stopped (Stop |
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program processing (STOP) |
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Lower position, bootstrap |
Controller starts the operating system loader |
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Push down |
Hardware reset |
(i.e. with a screwdriver) |
All outputs and flags are reset; variables are set to 0 or to |
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FALSE or to an initial value. |
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Retain variables or flags are not changed. |
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The hardware reset can be performed with STOP as well |
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as RUN in any position of the operating mode switch! |
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An operating mode (i.e., RUN/STOP) is internally changed at the end of a PLC cycle.
Note
The position of the mode switch is not important when starting or stopping the PFC application from WAGO-I/O-PRO.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
44 • Fieldbus Controller 750-841
Hardware
Attention
If outputs are set when switching from RUN to STOP mode, they remain set! Switching off the outputs on the software side i.e. by the initiators are ineffective because the program is no longer processed.
Note
With "GET_STOP_VALUE" (library "System.lib") WAGO-I/O-PRO CAA provides a function which recognizes the last cycle prior to a program being stopped. This gives you the ability to program the behavior of the controller’s outputs before a STOP condition. With this feature, the controller outputs can be switched to a safe state before the PFC stops.
3.1.2.7 Hardware Address (MAC-ID)
Each WAGO ETHERNET TCP/IP fieldbus controller is supplied from the factory with a unique and internationally unambiguous physical ETHERNET address, also referred to as MAC-ID (Media Access Control Identity). This is located on the rear of the controller and on a self-adhesive tear-off label on the controller’s side. The address has a fixed length of 6 Bytes (48 Bits) and contains the address type, the manufacturer’s ID, and the serial number.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP