ioLogik 4000
Hardware Installation
2-8
NA-4020/4021
LED Name
LED Color
LED Function
SYS
Off
No power.
Green
Steady On: Operating condition normal.
Red/Green
Toggling: Modbus error (e.g., watch dog timer error)
Red
Steady On: EEPROM checksum error.
Flashing: Memory error or CPU watchdog error.
Note: Please contact your vendor for assistance.
RxD
Off
No power or communication.
Green
Flashing: Receiving data from the serial port.
TxD
Off
No power or communication.
Green
Flashing: Sending data to the serial port.
I/O
Off
No I/O module detected.
Green
Steady On: System bus to I/O modules is running normally.
Flashing: System bus to I/O modules ready, but the network adaptor is
not exchanging data with I/O modules.
Red
Steady On: System bus communication failure.
Flashing: One or more I/O modules are in an error state.
Note: The following situations may cause a red I/O LED.
a. I/O module plugged in during operation.
b. I/O module not firmly locked on the rail.
c. One of the modules is damaged.
Field Power
Off
No 24 VDC field power
Green
24 VDC field power detected
LED Indicators for I/O Modules
Each DIO or AIO module is equipped with a Module Status LED indicating operation status.
LED Name
LED Color
LED Function
Status
Off
Not powered on during initialization.
Green
Steady On: System ready.
Flashing: I/O module ready for communication.
Red
Steady On: I/O module hardware problem.
Flashing: System bus communication error.
Each DIO or AIO channel is equipped with Channel Status LEDs. Refer to Chapter 4 for more information.
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