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7 Component Communications

7 - 6

E5C-T Digital Controllers Programmable Type Communications Manual (H186)

7-2 Operation for Component

Communications

Only two items can be sent from the master to the slaves: the fixed SP or program SP, and the

RUN/RESET status.

If the set point or the RUN/RESET 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 RUN/RESET 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 RUN/RESET 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/RESET status is sent to all of the slaves.

However, in a control system with a fast response, the slaves may not be able to response as quickly as

the master. If you transfer the program SP with component communications, be prepared for a delay in

operation due to a difference in timing.

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.

z Exception Processing

Levels

Component

communications

Operation level, program setting level, adjustment level, PID

setting 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

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/RESET is assigned to an event input (Changes in the set point will be

received.)

• When a communications error occurs three times in a row

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Unication E5 Spécifications Page 174