WAGO-I/O-SYSTEM 750
Diagnostics 199
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
11.1.2.1 USR LED
The bottom indicator LED ("USR") is provided for visual output of information.
Control of the LED from the application program is conducted using the functions
from the WAGO-I/O-PRO library "Visual.lib."
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11.1.3 Evaluating Memory Card Status
The access to the memory card is indicated by the SD-LED.
The SD-LED is directly above the memory card slot behind the transparent cover
flap.
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11.1.4 Evaluating Power Supply Status
The power supply unit of the device has two green LEDs that indicate the status
of the power supply.
LED 'A' indicates the 24 V supply of the coupler.
LED 'B' or 'C' reports the power available on the power jumper contacts for field
side power.
Table 71: Power supply status diagnostics – solution in event of error
LED Status Meaning
Solution
A
Green
Operating voltage for the system is
available.
-
Off
No power is available for the system
Check the power supply for the system
(24V and 0V).
B or C
Green
The operating voltage for power jumper
contacts is available.
-
Off
No operating voltage is available for the
power jumper contacts.
Check the power supply for the power
jumper contacts (24V and 0V).
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