Bradley Smoker PLC-5 Condition the use of BTR data with a data valid bit, BR0200 BWO200, 002

Communicating with a PLC-5 Adapter Channel 7-15

Example Bidirectional Repeating Block Transfer in

PLC-5/250 Supervisory Controller

Enter the following parameters in the block-transfer instructions in the supervisory processor.

Set the length to 0.

Use the remote I/O rack number for which you configure the adapter-mode processor.

Use the group and module numbers for which the adapter-mode processor is configured.

Condition the use of BTR data with a "data valid" bit.

All address comments for contacts shown in the following examples represent the set (1) state of the bit in the PLC-5 processor.

Read data from adapter-mode processor

BR020:0 BWO20:0

ENEN

Send data to adapter-mode processor

BR020:0 BWO20:0

ENEN

Buffer read data from adapter-mode processor to work area

BTR Done Bit	Data Not Valid Bit
BR020:0	I:020
DN	10

	BTR
BLOCK TRANSFER READ			EN
RACK		002
GROUP		0	DN
MODULE		0
CONTROL BLOCK		BR020:0	ER
DATA FILE		1BTD1:0
BT LENGTH		0
CONTINUOUS		N
BT TIMEOUT		3
	BTW
BLOCK TRANSFER WRITE			EN
RACK		002
GROUP		0	DN
MODULE		0
CONTROL BLOCK		BW020:0	ER
DATA FILE		1BTD2:0
BT LENGTH		0
CONTINUOUS		N
BT TIMEOUT		3
	FAL
	FILE ARITH/LOGICAL		EN
	CONTROL	1R0:0
	LENGTH	64	DN
	POSITION	0
	MODE	ALL	ER
	DEST	#1N0:0
	EXPRESSION	1BTD1:0

PLC-5 adapter-mode processor is configured for rack 2

Effects of Programming Block-Transfers to an Adapter-Mode Controller Channel on Discrete Data Transfer

Because the discrete transfer configuration files are used for discrete data transfer as well as block-transfer status exchanges between a supervisory controller and adapter-mode controller channel, performing multiple block-transfer to and from the adapter-mode controller channel impacts discrete data transfer.

Publication 1785-UM012D-EN-P - July 2005