Rockwell-automation 1771-DB BASIC MODULE Manuel d'utilisateur télécharger pdf (Page 312)

Chapter

Call Routines 69–127

13 -54

Input and Output Arguments

This routine has five input arguments and one output argument.

Argument Description Page

input 1

enables or disables the call 13 -54

input 2 BTR buffer, with or without the internal string, or the

internal string alone

13 -54

input 3 always 1 13 -54

input 4 the string number 13 -55

input 5 maximum word length allowed for the data packet 13 -55

output 1 call status 13 -55

Input Argument One

The first input argument enables or disables the call:

0 = disable the previously executed CALL 118

1 = enable CALL 118. These commands are acceptable:

PLC (Unprotected writes)

PLC (Word range writes)

PLC (Typed writes)

SLC 5/02 (Unprotected writes)

SLC 5/02 (Typed writes)

If the data received exceeds the string length or CPU file size, the

remaining data is truncated.

Input Argument Two

The second input argument is the selection of the BTR buffer with or

without the internal string, or the internal string alone:

0 = BTR buffer

2 = internal string

4 = BTR buffer and internal string

If you choose the internal string (2), the input/output table data

handshaking bit (17) is not used to indicate that data was received by the

BASIC module. In the BASIC program, you must monitor the second

character of the string (transaction number) which is incremented upon

every successful data transfer. Then you must remove the data from the

string before the next data packet is received or data is lost.

Input Argument Three

The third input argument is always 1.

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Rockwell-automation 1771-DB BASIC MODULE Manuel d'utilisateur Page 312