GE 90-30/20/Micro manual Command block has the following structure, Sysid

4

The command block has the following structure:

Length (in words)

Wait/No Wait Flag

Status Pointer Memory

Status Pointer Offset

Idle Timeout Value

Maximum Communication Time

Data Block

address address + 1 address + 2 address + 3 address + 4 address + 5 address + 6

to

address + 133

Information required for the command block can be placed in the designated memory area using an appropriate programming function.

_____

(enable)

REQ

(first word of Command block) —IN FT—

(rack/slot number) —SYSID

(task ID) —TASK _____

Parameters:

Parameter

Description

enable	When the function is energized, the communications request is performed.
IN	IN contains the first word of the command block.
SYSID	SYSID contains the rack number (most significant byte) and slot number (least
	significant byte) of the target device.
TASK	TASK contains the task ID of the process on the target device.
FT	FT is energized if an error is detected processing the COMMREQ.

Valid Memory Types:

Parameter

flow

%I

%Q

%M

%T

%S

%G

%R

%AI

%AQ

const

none

enable

•

IN

•

•

•

SYSID

•

•

•

•

•

•

•

•

•

TASK

•

•

•

•

FT

•

•

•Valid reference or place where power may flow through the function.

4-84 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K