Rockwell-automation 1771-DB BASIC MODULE Instrukcja Użytkownika Pobierz pdf (Strona 238)

100

101

Chapter

Call Routines 0–68

12 -48

Input Argument Eight

The eighth input argument is the selection of the BTR buffer and/or string:

0 = BTR buffer

2 = internal string

4 = BTR buffer and internal string

If you choose internal string (2), you can execute CALL 29 (page 12 -18)

to initiate each data transfer without requiring PLC processor interaction.

Input Argument Nine

The ninth input argument is always 1.

Input Argument Ten

The tenth input argument is the string number. If the eighth input

argument does not select internal string usage, the value of this input

argument is ignored, but you must still PUSH it.

Output Argument One

The output argument is the status of the call. It has these values:

0 = successful

1 = disabled

2 = bad input parameter

3 = port DH-485 not enabled (DF1 enabled)

4 = string is too small

5 = string is not dimensioned

6 = JW5 not in 16-point position

Whenever an attempt is made to read a remote packet, the status of the

read is placed into BTR word 1. These values have the same definition as

the output values in CALL 92 (page 13 -26). The status becomes valid

when the BASIC module sets the input image table bit 14.

Syntax

PUSH

type of DH-485 READ command

PUSH

remote node address

PUSH

remote file number

PUSH

remote file type

PUSH starting word offset of remote file

PUSH number of words to be transferred

PUSH message time-out value

PUSH selection of destination file (BTR buffer)

PUSH

PUSH string number

CALL

POP CALL 49 status

1 2 ... 233 234 235 236 237 238 239 240 241 242 243 ... 393 394

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