Rockwell-automation 900 Temperature Controller Communications Function Instrukcja Użytkownika Pobierz pdf (Strona 24)

Publication 900-UM004D-EN-E - July 2010

2-8 Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)

Detailed Description of

Services

Read from Variable Area

This service reads from variable areas.

• Variable Type and Read Start Address

For details on Variable Types and Read Start Addresses, refer to Chapter

3, Communications Data.

• Bit position

Bit accessing is not supported on the 900-TCx. It is fixed to 00.

• Number of elements

Table 2.7

Number of Elements Process

0000 The read operation is not performed (read data is

not appended to the service response PDU), and

processing ends in normal completion.

Double word 0001…0019 (1…25) The read operation is carried out, and processing

ends in normal completion.

Word 0001…0032 (1…50)

Read Data

(for number of elements)

Response

Code

SRC

MRC

0101

Service Response PDU:

Service Request PDU:

MRC

SRC

22 2

0101

Variable

Type

Read Start

Address

Bit

Position

Number of

Elements

Number of elements X 8 or 4

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 102 103

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Rockwell-automation 900 Temperature Controller Communications Function Instrukcja Użytkownika Strona 24