YOKOGAWA GX20 User Manual

4-13
IM 04L51B01-01EN
Using Modbus Functions (Communicating with Modbus devices)
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5
App
Index
4.5.2 Modbus Server/Slave Function
Function
The GX/GP supports the following functions.
Function Code Function Operation
1 Read the coil status
(0xxxx)
The client (master) device reads the coil status of the GX/
G P.
2 Read the input relay
status (1xxxx, 1xxxxx)
The client (master) device reads the input relay status of
the GX/GP.
3 Read the hold register
(4XXXX, 4XXXXX)
The client (master) device reads the GX/GP data.
4 Read the input register
(3XXXX, 3XXXXX)
The client (master) device reads the I/O, math, alarm,
time data from the GX/GP.
5 Change the single coil
status
(0xxxx)
The client (master) device changes the single coil status
(off/on) of the GX/GP.
6 Write to a single hold
register (4xxxx, 4xxxxx)
The client (master) device writes to a single hold register
of the GX/GP.
8
1
Loop-back test The master device performs a GX/GP loopback test.
15 Change the coil status
(0xxxx)
The client (master) device changes the coil status (off/on)
of the GX/GP.
16 Write to the hold register
(4XXXX, 4XXXXX)
The client (master) device writes to the GX/GP
communication channels.
1 Loopback test is only for serial communication.
4.5.3 RegisterAssignments(SharedwiththeModbusserver/slavefunction)
Input Register
Unit Type GX/GP Register
Number Data Type
GX/GP main unit I/O channel I/O data 300001 to 301000 32-bit signed integer
301001 to 302000 32-bit floating point
302001 to 302500 16-bit signed integer
Status information 302501 to 303000 16-bit signed integer
I/O channel
(continuous area)
I/O data 304001 to 304200 32-bit signed integer
304201 to 304400 32-bit floating point
304401 to 304500 16-bit signed integer
Status information 304501 to 304600 16-bit signed integer
Math channel
(A001 to 100)
Math data 305001 to 305200 32-bit signed integer
305201 to 305400 32-bit floating point
305401 to 305500 16-bit signed integer
Status information 305501 to 305600 16-bit signed integer
Math channel
(A101 to 200)
Math data 306001 to 306200 32-bit signed integer
306201 to 306400 32-bit floating point
306401 to 306500 16-bit signed integer
Status information 306501 to 306600 16-bit signed integer
GX/GP status 308001 to 308007 16-bit signed integer
Expandable I/O Unit 1
I/O channel
I/O data 310001 to 311000 32-bit signed integer
311001 to 312000 32-bit floating point
312001 to 312500 16-bit signed integer
Status information 312501 to 313000 16-bit signed integer
Unit 2
I/O channel
I/O data 315001 to 316000 32-bit signed integer
316001 to 317000 32-bit floating point
317001 to 317500 16-bit signed integer
Status information 317501 to 318000 16-bit signed integer
Unit 3
I/O channel
I/O data 320001 to 321000 32-bit signed integer
321001 to 322000 32-bit floating point
322001 to 322500 16-bit signed integer
Status information 322501 to 323500 16-bit signed integer
Unit 4
I/O channel
I/O data 325001 to 326000 32-bit signed integer
326001 to 327000 32-bit floating point
327001 to 327500 16-bit signed integer
Status information 327501 to 328000 16-bit signed integer
Continued on next page
4.5 Modbus Function and Register Assignments

YOKOGAWA GX20 Specifications

General

Brand	YOKOGAWA
Model	GX20
Category	Recording Equipment
Language	English