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7 Component Communications
E5
C-T Digital Temperature Controllers Programmable Type Communications Manual (H186)
7-3 T
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7
7-3
Troubleshooting
Possible problems that can occur with component communications and corrective actions are given in
the following table.
Note: For information on other problems, refer to
Status
Cause and corrective action
Page
The set point or RUN/RESET status
will not change for a slave (i.e., a
Controller with a communications
unit number other than 0).
The wiring to the slave is not correct.
The communications settings for the slave are not
correct.
•
The Protocol Setting parameter is not set to
cmp
.
•
The Communications Unit No. parameter is set to
the same value as another slave.
•
The setting of the Communications Baud Rate
parameter is not the same as the other slaves.
•
The Highest Communications Unit No. parameter
is not set to the highest communications unit
number that is actually set.
•
The Communications Writing parameter is set to
OFF.
◆
When the RUN/RESET Does Not Change
RUN/RESET is assigned to an event input for the
slave.
◆
When the Set Point Does Not Change
The set point from the master or the results of set
point calculations exceeds the set point limiter of the
slave.
The set points or the RUN/RESET
status will not change for any of the
slaves.
The wiring to the master (i.e., the Controller with
communications unit number 0) is not correct.
The communications settings in the master are not
correct.
•
The Protocol Setting parameter is not set to
cmp
.
•
The Communications Unit No. parameter is not set
to 0.
•
The Communications Baud Rate parameter is not
set to the same value as the slaves.
•
The Highest Communications Unit No. parameter
is not set to the highest communications unit
number that is actually set.
The set point is not calculated.
•
The SP Slope or SP Offset parameter is not set
correctly.
•
The set point was changed at the master when the
slave was stopped (setting area 1).
It is sometimes not possible to
change the set points or
RUN/RESET status.
There may be noise interference. Connect
terminating resistance to both ends of the
communications line.
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