Chapter 6 Error indication and Countermeasure
6.1 Error indication
The error indications of LED light when error is detected with remote modules and transmission lines.
Table 6.1 shows error indication of master module, and Table 6.2 shows error indication of slave module.
Table 6.1
Error indication of master module (EH-TRMME)
Error display LED
LED
Name of error
Contents of error
Check timing
(clear timing)
Counter
measure
Wrong setting of
rotary switch U
(upper)
It lights when setting
value to rotary switch
U (upper) is not
permitted. (Note 1)
Please set
rotary switch
U (upper)
correctly.
HERR
Hardware error
It lights when
hardware error of
master module are
detected.
(a)
When turning on
power supply
(b)
When pushing reset
switch
Please
exchange
master module.
REMOTE
EH-TRMME
RUN
RxD
HERR
CERR
POW
TxD
CERR
Communication
error
It lights when time
–out error occurs.
The time-out error is
detected when there is
no response from all
slave stations during
500ms. (Note 2)
Always (Note 3)
Please check
the setting and
wiring, etc.
according to
the trouble
shoot.
(Note 1) It lights when the set value of rotary switch U (upper) is B or C. Set value of 0 to 8, or F are reserved for enhancing in
the future, and master module doesn’t detect error for these value. Any setting of rotary switch L (lower) and DIP switches
doesn’t make error too, so please set correctly these switches.
(Note 2) When the communication error (time-out error) is detected, input data from slave stations are processed as follows
according to setting "HOLD" of a front DIP switch.
1)
HOLD ON: The last input data received correctly from slave stations are maintained in master module, and CPU
read these data.
2)
HOLD OFF: All input data from slave stations are cleared in master module, and CPU read these data.
(Note 3) If the communication returns normally, communication error (CERR) is automatically turned off.
Compact remote system executes the check to the unit of one word (=16 bits) by reverse double-transmission.
It is a mechanism that only illegal word data is abandoned when the error is detected and correct data before is maintained.
And in this case communication error (CERR) is not displayed.
Table 6.2
Error indication of slave module (EH-TRMLE)
Error display LED
LED
Name of error
Contents of error
Check timing
(clear timing)
Counter
measure
HERR Hardware
error
It lights when
hardware error of
slave module are
detected.
(c)
When turning on
power supply
(d)
When pushing reset
switch
Please
exchange slave
module.
RUN
RxD
HERR CE
POW
TxD
RR
REMOTE
EH-TRMLE
CERR
Communication
error
It lights when time
–out error occurs.
The time-out error is
detected when there is
no response from
master station during
500ms. (Note 2)
Always (Note 3)
Please check
the setting and
wiring, etc.
according to
the trouble
shoot.
(Note 1) Any setting of rotary switches and DIP switches doesn’t make error, so please set correctly these switches.
(Note 2) When the communication error (time-out error) is detected, output data from master module are processed as follows
according to setting "HOLD" of a front DIP switch.
1)
HOLD ON: The last output data received correctly from master module are maintained in slave module, and slave
module write these data to output modules on slave base.
2)
HOLD OFF: All output data from master module are cleared in slave module, and slave module writes these data
to output module on the slave base. So, all outputs on slave base turn off in this case.
(Note 3) If the communication returns normally, communication error (CERR) is automatically turned off.
Compact remote system executes the check to the unit of one word (=16 bits) by reverse double-transmission.
It is a mechanism that only illegal word data is abandoned when the error is detected and correct data before is maintained.
And in this case communication error (CERR) is not displayed.
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