Chapter 9 Maintenance, Check, Error 9-1 To; Dairy Check; Regular Check - Hitachi EH-150 Applications Manual

Chapter 9
Check the module dairy or regularly in order to use EH-ETH2 in best condition and keep the system run
normally.
9.1

Dairy Check

Check the following items in operation.
AS to EH-150 series PLC, see the application manual "EH-150 application manual (NJI-280*)" or "EHV-CPU
application manual (NJI-481*)".
Check item
Status of LEDs
*1: EH-ETH2 indicates the error content of module by the color and flash interval.
See "4.2 LED indications" for detailed information.
9.2

Regular Check

Take the following check items with power off the PLC and external I/O circuit at least once in half of a year
or more frequently according to your condition.
Check item
Installation
Connection of
transmission cable
Appearance
Environment
Spare module
Program
* Be careful not to change the module setting switch by mistake when you clean the module.
CAUTION at the time of the module exchange.
・We recommend that the module exchange is done under the connected equipment's power OFF.
MAC ID for the address resolution managed in the connected equipment side might not be updated if the
module exchange is done under the connected equipment's power ON, and therefore, the communication
cannot start.
Maintenance, Check, Error
Table 9.1
LED Method
POW
IER
ERR Visual check
STS
WDE
Table 9.2
Details
(1) Connection between module
and base
(2) Connectors
(3) Screws
(4) Cables
Is the cable disconnected?
Is the cable applied irregular
weight or tension?
Is the module very dusty?
Is there any unusual point?
(1) temperature
(2) humidity
(3) the others
Number of unit, storage
condition
Check program
Chapter 9 Maintenance, check, error
Dairy check item
Normal Typical cases of the problem
ON Voltage reduction
OFF Ethernet setting
OFF Connection open error or communication error
ON Blinking : Error
OFF Hardware error
Regular check
Measure
Check if it is no problem.
Check if LINK LED of Ethernet
connector is lighting.
Check if it is no problem
Check if it is no problem
0 to 55 °C
20 to 90% RH (no condensing)
No dust, foreign matter,
vibration
Check if it is no problem
The final programs in CPU and
in PC must be the same.
9-1
(*1)
Action
Tighten the screws
Connect firmly
Tighten the screws
Change the cable.
Check the wiring route
and if it's fixed
properly.
Cleaning up and
implement maintenance
Be sure to install in
appropriate condition
-
Check both master and
backup program.