Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual download pdf (Page 152)

Publication 1746-RM001A-US-P

12-2 Output Functions

CALL 23 – Transfer Data

from the CPU Files to

Port 1 or 2

Purpose

Use CALL 23 to transfer data from the CPU output data file or the CPU M0 file

directly to the module serial port and/or to a string within the module. The data is

transferred low byte first, then high byte or high byte first, then low byte to the

module port. The data can also be stored in a string for access by the BASIC

program.

The byte swap selection (low byte first, then high byte, or high byte first, then low

byte) of the last CALL 23 or CALL 22 executed determines the data packing

method for all ports enabled by CALL 23.

The low byte of the first word of the source file contains the character count (byte

count) of the data being transferred. If the byte count is larger than the file selected,

only the maximum number of bytes within the file are transferred. The high byte

of the first word is not used.

Execute CALL 23 to set up the data transfer parameters. After the CALL is

executed, the module gets data from the source file and transfers it to port PRT1,

port PRT2, or an internal string. Input and Output image file bits (word 0, bits 6

and 7) for the slot containing the module, are used to initiate and notify

completion of the transfer. The operation is described below:

1.1.

1. The ladder logic program of the SLC processor builds the data buffer. The

SLC then determines the byte count of the file to be transferred and places it

into the lower byte of the first available word to be transferred. This word plus

the data comprise the data file to be transferred.

Print numeric values in decimal notation. PRINT USING(#.#) 12-36

Restore the default print mode. PRINT USING(0) 12-37

Store variable. ST@ 12-38

Table 12.1 Chapter Reference Guide

If you need (to) Use this

mnemonic

Page

BYTE COUNT

DATA BUFFER

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 279 280

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Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual Page 152