
8
Operation
DH.21B/41B Controller
Manual – DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
64
8.1.3
LED "L2" (CAN 2 status)
LED "L2" indicates the status of the CAN 2 system bus.
Status LED
Possible cause
Measure
Orange
The CAN 2 system bus is being initial-
ized.
–
Green
The CAN 2 system bus is initialized.
–
Flashing green with
0.5 Hz
The CAN 2 system bus is in SCOM
suspend mode.
–
Flashing green with 1 Hz
The CAN 2 system bus is in SCOM On
mode.
–
Red
The CAN 2 system bus is off (BUS-
OFF).
•
Check and correct the cabling of
the CAN 2 system bus.
•
Check and correct the baud rate
set for the CAN 2 system bus.
•
Check and correct the terminating
resistors of the CAN 2 system bus.
Flashing red with 1 Hz
Warning on the CAN 2 system bus.
•
Check and correct the cabling of
the CAN 2 system bus.
•
Check and correct the baud rate
set for the CAN 2 system bus.
8.1.4
LED "L3" (IEC program status)
LED "L3" indicates the state of the IEC-61131 control program.
Status LED
Possible cause
Measure
Green
IEC program is running.
–
Off
No program is loaded.
Load a program into the controller.
Flashing orange with 1 Hz Program sequence has stopped.
Bootloader update required.
8.1.5
LED "L4" (controller status)
LED "L4" indicates the firmware status of the DH.21B/41B controller.
Status LED
Possible cause
Measure
Flashing green with 1 Hz
Firmware of the controller is running
correctly.
–
Red
•
No SD memory card inserted.
•
File system on the SD memory
card corrupt.
–
Flashing orange with 1 Hz Program sequence has stopped.
Bootloader update required.
8.1.6
LED "L5" (user)
LED "L5" is freely programmable in the IEC program.
22900055/EN – 08/2016
Summary of Contents for DH 21B Series
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