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 L9_MRTM EFB is used to transfer blocks of holding words from the program table to the command block, a group of output words. To verify each block transfer, an echo of the data contained in the first word of the command blocks returned to an input word. This echo verification excludes the status of the most significant bit (16#8000).

Representation

Parameters

Input Pin	Name	Data Type	Address Range	Meaning
Top	ENABLE	BOOL	–	ON = enables the operation
Middle	TRANSFER	BOOL	–	ON = transfer one block Table pointer of control table is increased by the value of LENGTH.
Bottom	RESET	BOOL	–	ON = reset The table pointer in the control table is set to start of transfer.

Node	Node Type	Name	Data Type	Address Range	Meaning
Top	IN	PROGRM	ArrUInt3	%MW	program table word 1: start of transfer word 2: end of table word 3: reserved
Middle	IN/OUT	CONTROL	ArrUInt5	%MW	control table word 1: reserved word 2: address output device in Traffic Cop word 3: address input device in Traffic Cop word 4: pointer in program table (only for internal use) word 5: error mask
Bottom	IN	LENGTH	UINT	1...127	number of words moved from the program table during each transfer Range: 1 to 127

Output Pin	Name	Data Type	Address Range	Meaning
Top	OUT	BOOL	–	echoes the status of the ENABLE input
Middle	COMPLETE	BOOL	–	block has been transferred from the program table to the command block (stays on only for one scan)
Bottom	END	BOOL	–	ON = pointer value ≥ table end

Mode of Functioning

The L9_MRTM transfers contiguous blocks of up to 127 words from a table of word blocks to a block size holding word area.

The L9_MRTM function block controls the operation in the following manner:

If power is applied to the...	Then ...
top input (ENABLE)	The function block is enabled for data transfers. NOTE: On initial startup, power must be applied to the bottom input.
middle input (TRANSFER)	The function block attempts to transfer 1 block. Before a transfer can occur, the echo word is evaluated. This evaluation excludes the status of the MSB (16#8000. Echo mismatch is a condition that prohibits a transfer. If a transfer is permitted, 1 block is transferred from the table starting at the table pointer. The table pointer in the control table is then incremented by the value LENGTH (bottom node). If the pointer’s new value is equal to or greater than the table end, the bottom output is turned on. A table pointer value less than the table end turns off the output.
bottom input (RESET)	The function block resets. The table pointer in the control table is reloaded with the start of commands value from the header of the program table

NOTE: The L9_MRTM function block is designed to accept indication of detected faults from 800 I/O modules, which echo valid commands to the controller, but set a bit to indicate the occurrence of a fault detected.

This method of indicating detected faults is common for motion products and for most other 800 I/O modules.

WARNING

UNINTENDED EQUIPMENT OPERATION

If using an I/O module that reports a detected fault condition in any other way, especially if the echo involved is not an echo of a valid command, take special care when writing the error handler for the ladder logic to ensure the fault is detected. Failure to do so may result in a lockup or some other undesirable performance of the L9_MRTM.

Failure to follow these instructions can result in death, serious injury, or equipment damage.