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7 Component Communications
7 - 6
E5@C Digital Temperature Controllers Communications Manual (H175)
7-2
Operation for Component
Communications
Only two parameter settings can be sent from the master to the slaves: the Set Point (SP) and the
RUN/STOP parameters.
If the set point or the RUN/STOP status is changed at the master, the new value is sent to the slaves
starting with the slave with communications unit number 1 and continuing on to the slave with the high-
est communications unit number. The master sends values only during operation. Values are not sent
while in the initial setting level.
If the set point or the RUN/STOP status is changed again while sending a previous value to the slaves,
the original value will not be transferred correctly. Always wait for a value to be sent to all of the slaves
before you change the set point or RUN/STOP status again.
For component communications, the master sends the value in order starting from slave 1. There will
be a delay of up to 30 ms between when the set point or RUN/STOP status is sent to all of the slaves.
If this delay is too long, consider using event inputs to change the set points or to change the
RUN/STOP status.
If communications with a slave fail, the master will retry communications twice. If communications still
fail, it will move to processing the next slave. To see if the value was sent correctly, check the display of
the Set Point or STOP parameter on each slave.
Exception Processing
Levels
Component
communications
Operation level, adjustment level, manual control level,
monitor/setting item level, and protect level
Setting area 0
Operates
Initial setting level, communications setting level, advanced
function setting level, and calibration level
Setting area 1
Stops
Master
• If the multi-SP is changed, the set point is sent to each slave.
• This function is disabled in the following cases:
• During operation with a remote SP
• When changing the set point for SP tracking
Slaves
• SPs are not calculated when operation is stopped.
• The value from the master is not received in the following cases.
• When the set point from the master or the results of set point calculation exceeds the set
point limiter of the slave.
• When Communications Writing parameter is set to “OFF”
• When RUN/STOP is assigned to an event input (Changes in the set point will be
received.)
• When a communications error occurs three times in a row
Содержание E5AC
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