112
1 FUNCTIONS
1.7 Communications Using MODBUS/TCP
Applicable devices
The following table lists the devices of the CPU module that can be set in the MODBUS devices.
*1 When setting a bit type device to the input register or output register, set it so that the number of assigned points will be a multiple of 16.
Otherwise, an error occurs in the engineering tool.
*2 The long counter (current value) and the long index register use two points of MODBUS devices.
*3 The assignment of the extended file register is fixed to the file register (ZR).
*4 The long timer (current value) and long retentive timer (current value) use four points of MODBUS devices. ( Page 113 Reading of
the long timer and long retentive timer)
*5 The step relay is read-only. An attempt of writing will cause an error.
*6 When the buffer memory is used, use H (hexadecimal constant) as the device symbol and set the address in hexadecimal notation. The
setting range is 1D5000H to 1D6FFFH. ( Page 369 User setting area for MODBUS/TCP function (Un\G1921024 to Un\G1929215))
Device name Symbol MODBUS device (: Can be assigned, : Cannot be assigned)
Coil Input Input register Holding
register
Extended file
register
Special relay SM
*1
*1
Special register SD
Input X
*1
*1
Output Y
*1
*1
Internal relay M
*1
*1
Latch relay L
*1
*1
Annunciator F
*1
*1
Edge relay V
*1
*1
Link relay B
*1
*1
Data register D
Link register W
Timer (contact) TS
*1
*1
Timer (coil) TC
*1
*1
Timer (current value) TN
Long timer (current value) LTN
*4
*4
Retentive timer (contact) STS
*1
*1
Retentive timer (coil) STC
*1
*1
Retentive timer (current value) STN
Long retentive timer (current value) LSTN
*4
*4
Counter (contact) CS
*1
*1
Counter (coil) CC
*1
*1
Counter (current value) CN
Long counter (contact) LCS
*1
*1
Long counter (coil) LCC
*1
*1
Long counter (current value) LCN
*2
*2
Link special relay SB
*1
*1
Link special register SW
Step relay
*5
S
*1
*1
Direct input DX
*1
*1
Direct output DY
*1
*1
Index register Z
Long index register LZ
*2
*2
File register R
ZR
*3
Refresh data register RD
Buffer memory H
*6
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