User manual

6-1

Distributed I/O System DP/ASi Link

EWA 4NEB 710 6055-02b

DP/ASi Link to S7

If you operate the DP/ASi link to an S7 (6ES7 156-0AA01-0XA0 or later,

version 1), you can re-assign the parameters of the ASi slaves connected to

the DP/ASi link during operation. This is done on the S7 by SFCs 59

“RD_REC” and 58 “WR_REC”, which permit data records to be read and

written.

 Read data records with SFC 59 ”RD_REC”

– Data record 140: Read lists and flags of ASi slaves

– Data record 141: Read parameter echo of ASi slaves

– Data record 2: Read response

 Write data records with SFC 58 ”WR_REC”

– Data record 142: Write parameters to ASi slaves

– Data record 143: Modify operating address of an ASi slave

– Data record 144: Set DP/ASi link to ”Offline” mode

You use SFC 59 to read a data record from the DP/ASi link. The parameters

are described in the table below:

Table 6-1 Parameters for SFC 59 “RD_REC”

Parameter Declaration Data Type Memory Area Description

REC INPUT BOOL I, O, M, D, L, Const. REQ = 1: Request to read

IOID INPUT BYTE I, O, M, D, L, Const. Area: DP/ASi link is a hybrid module IOID =

B#16#54

LADDR INPUT WORD I, O, M, D, L, Const. Logical address of the DP/ASi link.

Example: Logical address = 336 (decimal),

LADDR = W#16#150 (hexadecimal)

RECNUM INPUT BYTE I, O, M, D, L, Const. Data record number

Example: Data record 140, RECNUM =

B#16#8C

RET_VAL OUTPUT INT I, O, M, D, L If an error occurs while a function is being pro-

cessed, the return value contains an error code.

Introduction

SFC 59 ”RD_REC”