3-9
IM 04P01B01-17E
3
Using the RS-422A/485 Communication Interface (/C3 Option)
3.4
Modbus Slave Specifications
Registers
The registers for using the Modbus slave protocol are listed below. Binary values are
stored to the register in order from the highest byte.
30001 Measured data of CH01
30002 Measured data of CH02
30003 Measured data of CH03
30004 Measured data of CH04
30005 Measured data of CH05
30006 Measured data of CH06
30007 Measured data of CH07
30008 Measured data of CH08
30009 Measured data of CH09
30010 Measured data of CH10
30011 Measured data of CH11
30012 Measured data of CH12
30013 Measured data of CH13
30014 Measured data of CH14
30015 Measured data of CH15
30016 Measured data of CH16
30017 Measured data of CH17
30018 Measured data of CH18
30019 Measured data of CH19
30020 Measured data of CH20
30021 Measured data of CH21
30022 Measured data of CH22
30023 Measured data of CH23
30024 Measured data of CH24
Input Register Data
• The data is a 16-bit signed integer. The value is the same as the measured data
in binary output format (see page 5-14).
• The decimal point and unit information are not included.
Set them on the Modbus master.
• Valid channels vary depending on the device. An error response (code 2) occurs when an
invalid channel is read.
31001 Alarm status of the measured data of CH01
31002 Alarm status of the measured data of CH02
31003 Alarm status of the measured data of CH03
31004 Alarm status of the measured data of CH04
31005 Alarm status of the measured data of CH05
31006 Alarm status of the measured data of CH06
31007 Alarm status of the measured data of CH07
31008 Alarm status of the measured data of CH08
31009 Alarm status of the measured data of CH09
31010 Alarm status of the measured data of CH10
31011 Alarm status of the measured data of CH11
31012 Alarm status of the measured data of CH12
31013 Alarm status of the measured data of CH13
31014 Alarm status of the measured data of CH14
31015 Alarm status of the measured data of CH15
31016 Alarm status of the measured data of CH16
31017 Alarm status of the measured data of CH17
31018 Alarm status of the measured data of CH18
31019 Alarm status of the measured data of CH19
31020 Alarm status of the measured data of CH20
31021 Alarm status of the measured data of CH21
31022 Alarm status of the measured data of CH22
31023 Alarm status of the measured data of CH23
31024 Alarm status of the measured data of CH24
Input Register Data
• The value is the same as the alarm status in binary output format (see page 5-14). The
data is entered in the “A2A1A4A3” order in the register.
• Valid channels vary depending on the device. An error response (code 2) occurs when an
invalid channel is read.
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