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
3.3 Ladder Communication
3.3.1 Overview
By using ladder communication, you can easily perform communication between a PLC
(sequencer) and UTAdvanced. This kind of communication allows for the reading/writing
of D registers / I relays (internal registers of the UTAdvanced).
Hereinafter, PLC (sequencer) is referred to as PLC.
► D registers : Chapter 6 Functions and Applications of D Registers (for UT55A/UT52A/UP55A)
Chapter 8 Functions and Applications of D Registers (for UT35A/UT32A/
UT32A-D/UP35A/UP32A)
Chapter 10 Functions and Applications of D Registers (for UM33A)
Chapter 12 Functions and Applications of D Registers (for UT35A-L)
Chapter 14 Functions and Applications of D Registers (for UT75A)
CAUTION
The parameters of the UTAdvanced are placed in the D registers.
If the settings of some parameters are changed, the related parameters may be
initialized.
When changing the parameter setting, configure (write) the settings in the following
orders.
1. Setup parameters
1-1 Control mode parameter (CTLM) *1
1-2 Input -related parameters *2
1-3 Output-related parameters
1-4 Other necessary parameters
2. Operation parameters
2-1 Alarm type parameters
2-2 Alarm setpoint parameters
2-3 Other necessary parameters
*1: If the setting of CTLM (control mode) is changed, the related parameters will be initialized.
UT35A/UT32A/UT32A-D/UP35A/UP32A/UM33A does not have the parameter CTLM (Control
mode.)
*2: If the setting of IN (input type) is changed, the parameters related to ranges or scales such
as target setpoint etc. will be initialized.
Connecting with Ladder Communication
PLC (sequencer)
Up to 31 connected slaves with a maximum length of 1200 m