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

Data Forms of Commands
The table below shows the data forms of D registers.
Data type Data content Data form
PV high and low limits, target
setpoints, and others
PV range (EU) data Numerical data not including
the decimal point
Bias, deviation alarms, and others PV range span (EUS) data Numeric data not including
the decimal point
Proportional bands, output high
and low limits, and others
% data (0.0 to 100.0%) Numeric data not including
the decimal point
0 to 1000
Various modes, alarm types, and
others
Seconds, absolute values,
and data without unit
Absolute value not including
the decimal point
Various status (The type of
statuses are different by the
model.)
AD1.E, PV1.E_L1, MOD_L1,
ALM_L1, LA.ER, ALM_L2,
PV2.E_L2, MOD_L2,
ALO_L1, ALO_L2, PV_EV1-8,
TME_EV1-8, TME_EV9-16,
PV_EV_OUT, CT_AL, AD2.E,
DIMG, PA.ER, OP.ER,
ALOLA1_L1, ALOLA1_L2,
ALOLA2_L1, ALOLA2_L2,
ALOLA3_L1, ALOLA3_L2,
ALOLA4_L1, ALOLA4_L2
Mode status, alarm status,
error status
HEX code
For example, when the status
is "0x1234", the "1234" in
BCD code is returned.

Command Format for Communication
Example: When setting a target setpoint “50.0,” the PLC sends the value “500” excluding
the decimal point as command data (this is also true for setting 5.00 or 500).
Target setpoint: 50.0
Data to be sent from the PLC: 500
Command data: 500
* The UTAdvanced determine the decimal point position for “500” by
the decimal point position parameter setting (in this case, P.DP = 1).
UTAdvanced side
Response data from
UTAdvanced: 500
3.3.3 Configuration of Responses
Response from a UTAdvanced with respect to a command sent from the PLC consists of
the elements shown below.
Number of
Bytes
1 1 2 1 1 2 1 1
Number of
BCD digits
2 2 4 1 1 1 1 4 2 2
Element
Address
No.
CPU No.
(01)
Parameter
No.
0 5th
digit
R/W +/– Read/write
data
CR
(0D)
LF
(0A)
When responding to a data read command, the length of this
part varies: 64 data items at maximum.