Bradley Smoker PLC-5 user manual Examples of Block-Transfer Ladder Logic

7-14Communicating with a PLC-5 Adapter Channel

If you want to transfer controller-resident local I/O data of the adapter mode controller channel to a supervisory controller or if you want to transfer data from the supervisory controller to controller-resident local I/O of the adapter mode controller channel, you must use MOV or COP instructions within the adapter-mode controller channel to move the data in or out of the data file used in the adapter block-transfer control file.

Examples of Block-Transfer Ladder Logic

Example Bidirectional Repeating Block Transfer in

PLC-5 Supervisory Controller

	Read data from adapter-mode processor
	BTR and BTW enable bits
	BT17:15		BT17:10
					BTR
Enter the following parameters in the
					BLOCK TRANSFER READ		EN
block-transfer instructions in the		EN	EN		RACK	2
supervisory processor.					GROUP	0	DN
Set the length to 0.
					MODULE	0
Use the remote I/O rack number for					CONTROL BLOCK	BT17:10	ER
which you configure the					DATA FILE	N7:100
adapter-mode processor.					LENGTH	0
Use the group and module numbers for
					CONTINUOUS	N
which the adapter-mode processor is	Send data to adapter-mode processor
configured.	BTR and BTW enable bits
Condition the use of BTR data with a	BT17:15		BT17:10		BTW
"data valid" bit.					BLOCK TRANSFER WRITE		EN
All address comments for contacts shown in	EN		EN		RACK	2
the following examples represent the set (1)					GROUP	0	DN
state of the bit in the PLC-5 processor.					MODULE	0
					CONTROL BLOCK	BT17:15	ER
					DATA FILE	N7:200
					LENGTH	0
					CONTINUOUS	N
You may have to execute the BTR in the
PLC-5 scanner channel twice if the BTR’s
time delay is greater than 2-3 program
scans. If you do not run the BTR twice, the	Buffer read data from adapter-mode processor to work area
BTR will read old data from the
adapter processor.	BTR Done Bit			Data Not Valid Bit
				I:020
	BT17:10				COP
		DN	10		COPY FILE	#N7:100
					SOURCE
					DEST	#N7:300
PLC-5 adapter-mode processor channel is configured as rack 2					LENGTH	64

Publication 1785-UM012D-EN-P - July 2005