28
Manual – Controllers DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
4
Installing the DH.21B/41B option
Assembly and Installation Notes
LED L2
(CAN 2 state)
LED L2 indicates the state of the CAN 2 system bus.
LED L3
(IEC program
state)
LED L3 indicates the state of the IEC-61131 control program.
LED L4
(controller state)
LED L4 indicates the firmware state of the DH.21B/41B option.
LED L5 (User) LED L5 is freely programmable in the IEC program.
State of the L2 LED Diagnostics Remedy
Orange The CAN 2 system bus is being
initialized.
-
Green The CAN 2 system bus is being
initialized.
-
Flashing green
(0.5 Hz)
The CAN 2 system bus is currently in
SCOM suspend mode.
-
Flashing green
(1 Hz)
The CAN 2 system bus is currently in
SCOM On mode.
-
Red The CAN 2 system bus is off
(BUS-OFF).
1. Check and correct the cabling of the
CAN 2 system bus.
2. Check and correct the baud rate set
for the CAN 2 system bus.
3. Check and correct the terminating
resistors of the CAN 2 system bus.
Flashing red
(1 Hz)
Warning on the CAN 2 system bus. 1. Check and correct the cabling of the
CAN 2 system bus.
2. Check and correct the baud rate set
for the CAN 2 system bus.
State of L3 Diagnostics Remedy
Green IEC program is running. -
Off No program is loaded. Load the program into the controller.
Flashing orange
(1 Hz)
Program has stopped. Bootloader update required (see chapter "SD
memory card type OMH41B-T".)
State of the L4 LED Diagnostics Remedy
Flashing green
(1 Hz)
The firmware of option DH.21B/41B is
working properly.
-
Red • No SD card inserted.
• File system of the SD card is
corrupt.
Flashing orange
(1 Hz)
Program has stopped. Bootloader update required (see chapter
"SD memory card types OMH41B-T. and
OMC41B-T.")
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