Chapter 6 Error Indication And Countermeasure 6-1 To; Error Indication - Hitachi HIDIC EH150 EN-TRMME Applications Manual

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.
Error display LED
EH-TRMME
REMOTE
POW RUN
TxD RxD
HERR CERR
(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.
Error display LED
REMOTE EH-TRMLE
POW RUN
TxD RxD
HERR CE RR
(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.
Table 6.1 Error indication of master module (EH-TRMME)
LED Name of error
Wrong setting of
rotary switch U
(upper)
HERR
Hardware error
Communication
CERR
error
Table 6.2 Error indication of slave module (EH-TRMLE)
LED Name of error
HERR Hardware error
Communication
CERR
error
Contents of error
It lights when setting
value to rotary switch
U (upper) is not (a) When turning on
permitted. (Note 1)
(b) When pushing reset
It lights when
hardware error of
master module are
detected.
It lights when time
–out error occurs.
The time-out error is
Always (Note 3)
detected when there is
no response from all
slave stations during
500ms. (Note 2)
Contents of error
(c) When turning on
It lights when
hardware error of
slave module are
(d) When pushing reset
detected.
It lights when time
–out error occurs.
The time-out error is
Always (Note 3)
detected when there is
no response from
master station during
500ms. (Note 2)
6 – 1
Check timing Counter
(clear timing) measure
Please set
rotary switch
U (upper)
power supply correctly.
Please
switch
exchange
master module.
Please check
the setting and
wiring, etc.
according to
the trouble
shoot.
Check timing Counter
(clear timing) measure
Please
power supply
exchange slave
module.
switch
Please check
the setting and
wiring, etc.
according to
the trouble
shoot.