Hitachi EH-150 Applications Manual page 34

(8) Peripheral data receiving time-out, sum error, address error, response time-out
ERR LED
Flicker at 1 sec intervals
Run a loop-back check (refer to
section 7.3.)
Has an error occurred
YES
in the loop-back check?
Does it happen frequently?
to the station displayed as the
Has an error occurred
in the station displayed as the
Replace the module with a spare one,
if available.
Notify your local authorized distributor
of it.
A transmission time-out error is triggered in the peripheral device when an error occurs or the power is
switched of in the opposing link module during the sending and receiving of data with other stations.
(9) Link power supply cut-off
The data prevalent immediately prior to the power supply being switched off contained in the receiving
area of other stations that are receiving data from the cut-off station will be saved when the cut-off error
occurs during operations.
NO
NO
YES
Is the power supply
NO
opposing station on?
YES
YES
opposing station?
NO
Is the transmission
YES
cable coming loose?
NO
6-9
Chapter 6. Errors and error recovery
- Error information of own station : bit13 ON
- Error information of each station : bit13 ON
or
- Error information of own station : bit13 ON
- Error information of each station : bit15 ON
It may be assumed that this is a
temporary problem caused by noise, etc.
Observe developments for a while.
Switch on the power supply to the
station.
Locate the error on the station in which
the error occurred.
Secure the transmission cable firmly in
place.