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7 Component Communications 7-3 Troubleshooting Possible problems that can occur with component communications and corrective actions are given in the following table. Status The set point or RUN/STOP status will not change for a slave (i.e., a Controller with a communications unit number other than 0). The set points or the RUN/STOP status will not change for any of the slaves. The set point is not calculated. It is sometimes not possible to change the set points or RUN/STOP status. Cause and corrective action 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/STOP Does Not Change RUN/STOP 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 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 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). There may be noise interference. Connect terminating resistance to both ends of the communications line. Page 7-2 7-3 7-5 7-4 7-5 7-2 7-3 7-4 7-2 Note: For information on other problems, refer to A-2 Troubleshooting. 7-6 E5@C Digital Temperature Controllers Communications Manual (H175)
