Yokogawa JUXTA M Series Digital Limit Alarms MVTK Manual do Utilizador descarregar pdf (Página 42)

4-2

IM 77J04J11-01E 1st Edition : 2006.08.25-00

4.2 Commands/Responses at the PLC

The PLC sends commands and receives responses to these commands. The com-

mands and responses that can be used are as follows.

4.2.1 Configuration of Command/Response

Commands sent from the PLC to the M Series and responses from the M Series with

respect to a command sent from the PLC consist of the following elements.

Number of Bytes 1 1 221111

Number of BCD Digits 2 2 1 4422111

Command/Response

element

Address

number

(ADR)

Parameter

number

CPU

number

(0D)

(0A)

0 R/W +/-0 Data

Can be changed only during a read operation.

A maximum of 64 data items

(1) (2) (3) (4) (5) (7) (8) (9)(6)

(1) Address Number (01 to 99)

Address numbers are used by the PLC to identify the M Series at the communication

destination. (Identification numbers specific to individual M Series.)

(2) CPU Number

This is fixed to 01.

(3) Parameter Number

This is 4-digit BCD data of a D register number with its leading character D removed.

I relays cannot 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.

(6) R/W

0: Read

1: Write

(7) +/-

0: Positive data (+)

1: Negative data (-)

(8) Data

For read operation, this is the number of data items to be read.

For write operation, it is the setting data.

(9) CR and LF

These control codes indicate the end of a command. The corresponding control

character strings for CR and LF are 0D and 0A in hexadecimal in ASCII code, respec-

tively.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 69 70

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