User Manual

6-9
IM 04L21B01-17EN
Specifications
1
2
3
4
5
6
App
Index
Hold Register (shared with the Modbus slave function)
• Common Items
• The client device can read and write to the hold registers.
• Communication input data is an option (/M1, /PM1, or /PWR1).
• Reading from and Writing to Communication Input Channels
Communication input data can be handled on a computation channel by including the
data in the equation of a FX computation channel.
Hold Register Data Data Type
400001 Communication input data C01
16-bit signed integer
| |
400024 Communication input data C24
• Precautions to be taken when the client device reads the data
The communication input data of the FX is floating point type, but the data is converted to
signed 16-bit integer when the data is read.
• Precautions to be taken when the client device writes the data
Only data in signed 16-bit integer type can be written. Floating point values cannot be
written.
400601 Lower bytes of communication input data C01
32-bit floating point
400602 Higher bytes of communication input data C01
| |
400647 Lower bytes of communication input data C24
400648 Higher bytes of communication input data C24
• Precautions to be taken when the client device writes the data
Input range: –9.9999E29 to –1E–30, 0, 1E–30 to 9.9999E29
If values outside this range are used on a computation channel, a computation error
occurs.
400301 Lower bytes of communication input data C01
32-bit signed integer
400302 Higher bytes of communication input data C01
| |
400347 Lower bytes of communication input data C24
400348 Higher bytes of communication input data C24
• Note when a client device reads data
The FX communication input data is floating-point, but when it is read, it is converted to 32-
bit signed integer.
• Note when a client device writes data
Data can only be written in 32-bit signed integer. Floating-point values cannot be written.
• Operating Devices
You can use the following hold registers. You can perform a portion of the operations
by writing in the registers.
• Internal switch
• Lot number
• Batch number
• Recording (memory sampling) start and stop
• Alarm ACK
• Computation start, computation stop, computation reset, computation dropout ACK
• Manual sampling, event data sampling start trigger, and snapshot
• Message and free message writing
6.3 Modbus Protocol Specifications