YOKOGAWA UTAdvanced Series, User Manual

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IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3
3.1.5 Messages and Responses
These instruction words are used so that the host computer obtains the D register and I
relay information of the UTAdvanced.
List of Function Codes
Code No. Function Description
01 Reading of multiple I relays
Up to 256 I relays can be read continuously (I4001 to I7072).
03
Reading of multiple D
registers
Up to 100 D registers can be read continuously (D0001 to D7600*).
05 Writing of I relays
Only one I relay can be written (I4001 to I7072).
06 Writing of D registers
Only one D register can be written (D0001 to D7600*).
08 Loopback test
This is used to check the communication connection.
15 Writing of multiple I relays
Up to 256 I relays can be written continuously (I4001 to I7072).
16 Writing of multiple D registers Up to 50 D registers can be written continuously (D0001 to D7600*).
66 Random reading
Up to 100 registers can be read at random (D0001 to D7600*).
67 Random writing
Up to 50 registers can be written at random (D0001 to D7600*).
68 Specify monitor
Up to 100 registers can be specified at random for monitoring (D0001
to D7600*).
69 Monitoring
The register specified by
“
specify monitor” is read.
70
Writing of multiple D registers
for program pattern
Up to 80 D registers can be written continuously (D8001 to D9000).
*: When UP55A/UP35A/UP32A; D001 to D9000
Function codes cannot be written to read-only or use-disabled D registers / I relays.
Broadcast specification is possible with function codes “05,” “06,” “15,” “16,” “67,” and “68”
only.
(Also in this case, read-only or use-disabled D registers / I relays will not be written.)
3.1 Modbus Communication