Fig. 12-24: Initialization and cyclic monitoring of the CPU load
This program section has to be called cyclically. Once the value "TRUE" was de-
tected for the variable "gboOverload", the PLC user program should respond ac-
cordingly, e.g. by switching off program parts or executing a minimal program.
13
Error causes and troubleshooting
The following table describes the LEDs on the power connector.
LED LED display Error causes and troubleshooting
U
L
LED is off 24 V voltage error
24 V supply voltage is not connected
24 V supply voltage is connected with reverse polarity
ON LED is off Error when loading the programmable logic
Initiate fallback mode (see chapter 12.5 "Fallback and recovery" on
page 54)
T LED is red Temperature error
Control was switched off due to overheating.
● Ensure a lower ambient temperature
● Check the control installation
● Avoid heat accumulation impeding the natural convection
Tab. 13-1: LEDs in the voltage power connector
Further operating displays and error displays are located on the individual mod-
ules and terminals. For information on the other displays, refer to the manual of
the IndraControl S20 component (see also chapter 1.3 "Related documents" on
page 2).
IndraControl XM21, XM22 Controls
59/69
Error causes and troubleshooting
R911340667_Edition 04 Bosch Rexroth AG
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