7 Detailed Functions
7 - 48
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
<Modbus (C078 = 01)>
Write data in the holding register address 0006 hex. (100% = 10,000)
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: 100500
Convert it to ASCII: 31 30 30 35 30 30
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).
• 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.
Register No. Function name
Parameter
No.
R/W Monitor or setting data
Data
resolution
0006hex PID feedback – R/W 0 to 10000 0.01 [%]
Feedforward Selection
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