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SC-F70
SC-F70
PID Operation Operating Instructions
5.3 Using the Communication Functions
When the controller is equipped with communication functions, a
remotely installed personal computer (PC) can perform all functions that
would normally be done locally on the operation panel.
The communication functions enable you to read from or write to any or
all of, the AREAs and PARAMETERs.
Each controller can have a unique device address so that multiple
controllers (to a maximum of 31) can be controlled by one PC.
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Communication Specifications
Use one of the following interface types (specify with order):
∑
EIA RS-422A: 4-wire multidrop connection
∑
EIA RS-485: 2-wire multidrop connection
∑
EIA RS-232C: 3-wire point-to-point connection
See page 112 for other specifications.
For operation details, refer to the "SC-F70 Multicontroller Operating
Instructions for Communications" booklet.
5.4 Using Other Convenient Features
The following commonly used features enable more sophisticated
operation.
1. Starting automatic operation just after the controller is turned on:
∑
Set item No.5 (MSL) of the parameter PG08 to '1'.
2. Shutting off the valve output from a remote location:
∑
Set item No.3 (MMV) of the parameter PG08 to '3', and at the
appropriate time, change the operation mode to MAN by remote
contact input.*
3. Preventing the controller from being set above (or below) the
predetermined pressure level by an operator:
∑
Set item No.1(SVL) or 2(SVH) of the parameter PG10 to the upper
or lower limiter value.
* This operation can be done only when the control valve actuator
moves in reverse. In addition, the description is valid only for the
heating portion of the heating, cooling PID operation.