Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal User Manual

Page 252

Instructions

Chapter 18
I/O Message and Communication

18–6

After you enter an address, the display changes to the following.

7. Enter Message Length –

ZOOM on MSG –(MSG)– 2.0.0.0.*
NAME: MESSAGE READ/WRITE
MSG TYPE: WRITE LD/LS ADDR:N7:40
TARGET: 500 CPU TARG NODE: 5
CTRL BLK: N7:0 TARG OS/AD:N7:6
CTRL BLK 7 WORDS MSG LEN: 0
ENTER MESSAGE LENGTH:0

This is the length of the message in elements. The 1–word elements are
limited to a maximum length of 41. The 3–word elements (T,C,R) are
limited to a maximum length of 13.

The destination file type determines the number of words that are
transferred. Examples: A MSG read instruction specifying a target file
type C (counter), a destination file type N (integer), and a length value of
1 will transfer 1 word of information. A MSG read instruction specifying
a target file type N, a destination file type C, and a length value of 1 will
transfer 3 words.

The message length is the final parameter. After you enter it, the display
changes to the following.

ZOOM on MSG –(MSG)– 2.0.0.0.*
NAME: MESSAGE READ/WRITE
MSG TYPE: WRITE LD/LS ADDR:N7:40
TARGET: 500 CPU TARG NODE: 5
CTRL BLK: N7:0 TARG OS/AD:N7:6
CTRL BLK 7 WORDS MSG LEN: 2
SELECT MESSAGE TYPE.
READ WRITE ACCEPT

Pressing

[F5]

, ACCEPT, completes the entry of parameters. If you must

change any of the parameters, you can run through the entry of
parameters again before you press ACCEPT.