GE 90-30/20/Micro manual System Communications Window Models 331 and Higher

2

The following figure is a flow chart for the programmer communications portion of the sweep.

a45659

START

HAND-HELD

PROGRAMMERPROGRAMMER

ATTACHED PROGRAMMER ATTACHED

ATTACHED

STATUS

PREVIOUS

ATTACHEDSTATUS

?

NOT

NOT

ATTACHED

PREVIOUS

STATUSATTACHED

?

NO PROGRAMMER REQUEST

?

YES

ATTACHED

ABORT	SETUP FOR
OPERATION	HAND-HELD
IN PROGRESS	PROGRAMMER

KEY NO PRESSED

?

YES

PROCESS REQUEST

SETUP FOR	SEND INITIAL	PROCESS KEY
SERIES 90
	DISPLAY
PROTOCOL

SEND NEW DISPLAY

STOP

Figure 2-2. Programmer Communications Window Flow Chart

System Communications Window (Models 331 and Higher)

This is the part of the sweep where communications requests from intelligent option modules, such as the PCM, are processed (see flow chart). Requests are serviced on a first-come-first-served basis. However, since intelligent option modules are polled in a round-robin fashion, no intelligent option module has priority over any other intelligent option module.

2-10 Series 90-30/20/Micro Programmable Controllers Reference Manual– September 1998 GFK-0467K