Rockwell Automation 2707-NP DTAM Programming Software - Manual (Page 111)

Chapter 14
Entering DTAM Configuration Data
14–5
Advisor Operation
The following shows how the Advisor function operates. The controller
program must reset the ACK and NAK bits after writing a screen number.
➀
➁
Controller writes screen number to assigned Read Register.
➂
DTAM reads advisor read register and
displays corresponding screen (if valid). Controller monitoring ACK bit clears
ACK/NAK bits for next screen number.
DTAM writes Advisor write register
ACK bit indicating that the screen dis-
play was changed. Or writes NAK bit
if an invalid screen was read
➃
If the controller sends an invalid screen number (not a programmed screen)
the DTAM writes the write register NAK bit (always next sequential bit
following ACK bit). The NAK bit indicates to the controller that the screen
number is incorrect.