Feedforward Selection - Omron RX Series User Manual

7 Detailed Functions
<Modbus (C078 = 01)>
Write data in the holding register address 0006 hex. (100% = 10,000)
Register No.
0006hex PID feedback
Precautions for Correct Use Precautions for Correct Use
Although the PID feedback function supports reading/writing of data, you can write data only
when PID Feedback Selection is set to Modbus communication. You cannot write data with other
settings.
<ASCII (C078 = 00)>
Transfer data using the command 01. To transfer the feedback data, set the most significant byte of the
frequency data to 1.
(Example)
To send 5 Hz:
Transmission data is "Set value x 100" and has 6 bytes: 000500
Set the most significant byte to 1:
Convert it to ASCII:
Precautions for Correct Use Precautions for Correct Use
Note that, in the ASCII method, the set value is frequency [Hz].
• When the PID Feedback Selection (A076) is set to 03 (Pulse train input), the pulse train frequency
input to the PG Board (Model: 3G3AX-PG01) will be fed back.
The feedback value is the result of percentage conversion, as 100% of the frequency set in the Pulse
Train Frequency Scale (P055).

Feedforward Selection

• Select the terminals used to input the feedforward signal in the PID Feedforward Selection (A079).
• The A079 setting will be used "as is" even if the terminal selected in A079 overlap with the terminal
selected for the target/feedback value.
• If A079 is set to Disabled, feedforward control will not be performed.
• Feedforward control is effective for tension control applications, where the tension is controlled
according to the line speed. In this case, the line speed is input as the feedforward signal.
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Parameter
Function name
No.
–
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
R/W Monitor or setting data
R/W 0 to 10000
100500
31 30 30 35 30 30
Data
resolution
0.01 [%]