Description

Naming

Name in LL984 Editor	Function Block Name
name of legacy 984 instruction	name in other tools and editors like: Type Library Browser Data Editor Animation Tables Search Results

Function Description

The purpose of the L9_XMIT function block in communication mode is to receive and transmit ASCII messages and Modbus Master messages using your PLC ports.

For an overview of the L9_XMIT function block please see Description.

Representation

Parameter Description

Input Pin	Name	Data Type	Address Range	Meaning
Top	ENABLE	BOOL	–	ON begins an L9_XMIT operation and ENABLE should remain ON until the operation has completed successfully or an event has occurred.
Middle	STOP	BOOL	–	ON aborts any active L9_XMIT operation and forces the port to slave mode. The abort code (121) is placed into the event status word. The port remains closed as long as this input is ON. NOTE: To reset an L9_XMIT event and clear the event word, the top input must go OFF for at least one PLC scan.

Node	Node Type	Name	Data Type	Address Range	Meaning
Top port #0000, #0001, or #0002	PORTNO	IN	UINT	0...2	The top node contains one of the following constants: (#0000) to select PLC port #0, (#0001) to select PLC port #1, or (#0002) to select PLC port #2.
Middle	CONTROL	IN/OUT	ARRAY[1..16] OF UINT	%MW	The %MW entered in the middle node is the first in a group of sixteen (16) contiguous memory words that comprise the control block, as shown in the Communication Control Table. (For expanded and detailed information on this node please see the Communication Control Table.) Important: DO NOT modify the address in the middle node of the L9_XMIT function block or delete the address from the function block while the program is active. This action locks up the port preventing communications.
Bottom #0016	LENGTH	IN	UINT	16	The bottom node must contain a constant equal to (#0016). This is the number of memory words used by the L9_XMIT function block.

Output Pin	Name	Data Type	Address Range	Meaning
Top	ACTIVE	BOOL	–	ON while an L9_XMIT operation in progress. Passes power while an L9_XMIT operation is in progress.
Middle	STOPPED	BOOL	–	ON when L9_XMIT has detected an event or was issued an abort. Passes power when L9_XMIT has detected an event or when an L9_XMIT operation was aborted.
Bottom	SUCCESS	BOOL	–	ON for one scan only when an L9_XMIT operation has been successfully completed. Passes power when an L9_XMIT operation has been successfully completed. NOTE: The ENABLE input must remain ON until SUCCESS has turned OFF.