Download Compact link module (EH-TLNKE) APPLICATION

Chapter 7 Daily and Periodic Inspection
7.1
Daily inspection
Verify the following items while the system is running. Please refer to Chapter 3 for detail of LED display, and
Chapter 6 for detail of error indication and countermeasure.
Table 7.1.1 Items for daily inspection of link module
Item
Inspection
method
LED
Normal status
Abnormal
status
Confirmation of
operation
Watching
POW LED
RUN LED
Lighting
Off
Confirmation of
error
Watching
HERR LED
CERR LED
Off
Lighting
/blinking
Confirmation of
communication data
Watching
TxD LED
RxD LED
Blinking
/lighting thinly
7.2
Always
lightning
or off
Main cause of error
• Power LED off: 5V DC power malfunction
• RUN LED off: communication is stopped
• HERR LED lightning: breakdown of module
• CERR LED lightning: time-out error
• TxD LED off: breakdown of link module etc.
• RxD LED off: disconnection of line etc.
Periodic inspection
Turn off the power for the external I/O circuits and link system, check the following items.
Table 7.1.2 Items for periodic inspection of link module
Item
Method
All screws of connecter for communication are tight.
Tighten surly.
Removal of dust on case and connecter.
Removal with cleaner etc.
Periodic inspection must be done once every 6 months at least. Please bring the check cycle forward with
respondent to the installation environments such as the vibration and dust.
7–1