User manual

6-2

Distributed I/O System DP/ASi Link

EWA 4NEB 710 6055-02b

Table 6-1 Parameters for SFC 59 “RD_REC”, continued

Parameter DescriptionMemory AreaData TypeDeclaration

BUSY OUTPUT BOOL I, O, M, D, L BUSY = 1: Read operation still being processed

RECORD OUTPUT ANY I, O, M, D, L Destination area for data record read

Example: Data record 140 (22 bytes long) is to

be stored in bit memory address area from MB

50 onward, RECORD = P#M50.0 BYTE22

You use the SFC 58 to transfer a data record to the DP/ASi link. The parame-

ters are described in the table below:

Table 6-2 Parameters for SFC 58 “WR_REC”

Parameter Declaration Data Type Memory Area Description

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

IOID INPUT BYTE I, O, M, D, L, Const. Area: The 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 143, RECNUM =

B#16#8F

RECORD INPUT ANY I, O, M, D, L Data record

Example: Data record 142 (2 bytes long) is to

be read in the bit memory address area from

MB 50 onward, RE CORD = P#M50.0 BYTE2

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.

BUSY OUTPUT BOOL I, O, M, D, L BUSY = 1: Write operation still being pro-

cessed

You will find a detailed description of SFC 58 and SFC 59 in the System and

Standard Functions reference manual.

In Section You Will Find on Page

6.1 Reading Data Records with SFC 59 “RD_REC” 6-3

6.2 Writing Data Records with SFC 58 “WR_REC” 6-5

6.3 Example of Re-assigning Parameters to the DP/ASi Link

with S7

6-6

SFC 58 ”WR_REC”