
A-90188E-01 MAINTENANCE 1.Series 16i/18i/21i MAINTENENCE INFORMATION
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1.1.2 LED Indications
The MODBUS/TCP board for LCD-mounted type 16i/18i/21i
incorporates the following LEDs: Four green STATUS LEDs and one
red ALARM LED for indicating the status. Two green LEDs, one
yellow LED, and one red LED for indicating the communication
status. The figure below shows the locations of these LEDs. The table
below explains the LED lighting states.
In the following explanations, the LED lighting states are expressed as
follows:
□: Off ■: On ☆: Blinking ◊: Don't care
LED lighting sequence at power on
No. LED indication
1234 MODBUS/TCP board state
1
STATUS
□□□□
Power off
2
STATUS
■■■■
Initial state after power on
3
STATUS
□■■■
MPU initialized.
4
STATUS
□□■■
Firmware downloaded.
5
STATUS
□□□■
Control migration to OS
6
STATUS
■■■□
OS PHASE1
7
STATUS
□■■□
OS PHASE2
8
STATUS
■□■□
OS PHASE3
9
STATUS
□□■□
OS PHASE4
10
STATUS
☆□□□
Startup completed.
The system enters the No.10 status when the MODBUS/TCP board
starts normally. This status is maintained until an error occurs.
CD38V
LED3 (GREEN)
LED2 (GREEN)
LED1 (GREEN)
AL M (R ED)
BTX (GREEN)
COL (RED)
LED4 (GREEN)
LIL (GREEN)
COM (YELLOW)
CD38V
LED3 (GREEN)
LED2 (GREEN)
LED1 (GREEN)
AL M (R ED)
BTX (GREEN)
COL (RED)
LED4 (GREEN)LED4 (GREEN)
LIL (GREEN)
COM (YELLOW)