GE GFK-1541B manual Cimplicity ME

4

COMMREQ Function Block and Command Block

This section describes the programming structures common to all Communications Requests: the COMMREQ Function Block and the Command Block.

The COMMREQ Function Block

The Communications Request is triggered when the logic program passes power to the COMMREQ Function Block.

(Enable ) -------------

(Command Block address) -

(Rack/Slot Location of	-
the Ethernet Interface)
(Task value)	-

COMM

REQ

IN FT

SYSID

TASK

- Function Faulted (logic)

Each of the inputs and outputs are discussed in detail below. It is important to understand that the Command Block address points to the location in memory you have setup as the Command Block.

Enable: Control logic for activating the COMMREQ Function Block. See Section 5 for tips on developing your program.

IN: The location of the Command Block. It can be any valid address within a word-oriented area of memory (%R, %AI, or %AQ for the Series 90-30 Ethernet Interface).

SYSID: A hexadecimal word value that gives the rack (high byte) and slot (low byte) location of the Ethernet Interface. Note that if using GE Fanuc’s VersaPro PLC software, the leading zeros in this hexadecimal word value are not displayed on-screen; for example, 0004 will appear as 4.

Examples:

Rack

Slot

Hex Word Value

(LM90)

Hex Word Value

(VersaPro,

CIMPLICITY ME)

0	4	0004H	16#0004
3	4	0304H	16#0304
2	10	020AH	16#020A
4	2	0402H	16#0402

GFK-1541B Chapter 4 Programming Modbus/TCP Channel Commands 4-5