YOKOGAWA UT150L, Руководство пользователя

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IM 05C01E22-10E
3-3
Chapter 3 PC Link Communication
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Data Form of Commands
The table below shows the data forms of commands for D registers and I relays.
Table 3-1 Data Forms of Commands for D Registers and I Relays
PV high and low limits, target setpoints, and oth-
ers
Proportional bands, upper and lower limits of
output, and others
Bias, deviation alarms, and other
Type of Data
Various modes, alarm types, and others
Contents of Data
Measuring range width (EUS) data
Measuring range (EU) data
% data (0.0 to 100.0%)
Seconds, absolute values, and data
without unit
Specified Form
Numeric data not including the deci-
mal point
Numeric data not including the deci-
mal point
0 to 1000
Absolute values not including the
decimal point
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Command Format for Communication
Example: When setting a target setpoint “50.0” to a UT150L, the host device sends the value “500” as
command data without the decimal point (this is true for both setting 5.00 or 500).
Data to be send from the host device: hexadecimal value of 500 (01F4)
Command data: 01F4 Response data from UT150L: 01F4
UT150L side
Target setpoint: 50.0
*
The position of the decimal point for “500” is determined by the DP (position of decimal point) parameter of the UT150L.
3.1.2 Configuration of Response
Responses from UT150L with respect to a command sent from the host device consists of the ele-
ments shown below, which differ depending on the condition of communication; normal or failure.
1) Normal Communication
When communication is complete normally, UT150L return a character string “OK” and when the
read commands, return read-out data.
Number of
Bytes
Element
1
STX
2
Address
number
(ADR)
2
CPU
number
01
Variable length
Parameter data
2
Checksum
1
ETX
1
CR
2
OK
2) In the Event of Failure
If communication is complete abnormally, UT150L return a character string “ER” and error code
(EC1 and EC2). (See subsection 3.2.4, Response Error Codes.)
• No response is made in case of an error in address number specification or CPU number specification.
• If a UT150L cannot receive ETX in a command, response may not be made.
* As a measure against those, provide a timeout process in the communication functions of the host
device or in communication programs.
Number of
Bytes
Element
1
STX
2
Address
number
(ADR)
2
CPU
number
01
3
Command
2
Checksum
1
ETX
2
EC1
2
EC2
1
CR
2
ER