Yokogawa JUXTA VJ Series Limit Alarms - Manual (Page 38)

4-2
<Toc> <Ind> <4. Ladder Communication >
IM 77J01J11-01E
4.2 Commands/Responses at the PLC
The PLC sends commands and receives responses to commands. The commands
and responses that can be used are as follows.
4.2.1 Command/Response Component Elements
Commands sent from the PLC to the VJ Series signal conditioners are configured as
shown below.
Number of Bytes 1 1 2 2 1 1 1 1
Number of BCD Digits 2 2 1 4 4 2 2 1 1 1
Command/Response
Element
Address
number
(ADDRESS)
Parameter
number
CPU
number
01
CR
(0D)
LF
(0A)
5th
digit
0 +/- 0 Data
040201E.EPS
Variable only for responses.
A maximum of 64 data items
(1) Address number (01 to 99)
Numbers used by the PLC to identify the VJ Series signal conditioners at the commu-
nication destination. (They are identification number specific to individual VJ Series
signal conditioners.)
(2) CPU number
This number is fixed to “01”.
(3) Parameter number
This is 4-digit BCD data of a D register number, not including "D." No I-relays can be
specified.
See Also
Chapter 6 for more information on D registers.
(4) 0
This is fixed to "0."
(5) 0
This is fixed to "0" for commands, while it is 5th digit of read data for responses.
(6) 0
This is fixed to "0."
(7) +/-
This is fixed to "0" for commands, while it is 0: positive data (+) or 1: negative data (-)
for responses.
(8) Data
This is data to be read for commands, while it is the number of read data for re-
sponses.
(9) CR and LF
These are the control codes indicating the end of a command. The corresponding
control character strings are CR, which is 0D in hexadecimal in ASCII code, and LF,
which is 0A in hexadecimal in ASCII code.
3rd Edition : Oct. 15, 2007-00