Control Features; Datalinks - Allen-Bradley 1203 Series User Manual

4–2 Creating Ladder Logic Programs
8 words maximum
8 words maximum

Control Features

Datalinks

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DIP switches on SW3 determine how the data contained in the
programmable controller I/O image table is used in the drive. Figure
4.1 shows an I/O image table.
Figure 4.1 I/O Image Table
Remote I/O
Remote I/O
Controller
Communications
Image
Output Image
O:010 Block Transfer
O:011 Logic Command
O:012 Reference
O:013 Datalink A1
O:014 Datalink A2
O:015 Datalink B1
O:016 Datalink B2
O:017 Datalink C1
Datalink C2
Datalink D1
Datalink D2
Input Image
I:010 Block Transfer
I:011 Logic Status
I:012 Feedback
I:013 Datalink A1
I:014 Datalink A2
I:015 Datalink B1
I:016 Datalink B2
I:017 Datalink C1
Datalink C2
Datalink D1
Datalink D2
1
Optionally enabled using DIP switches on the module. Refer to Chapter 2.
SW 3.1 through SW 3.3 select the basic control features: Block
Transfer, Logic Command/Status, and Reference/Feedback. When
enabled, each of these features adds one word to the input I/O image
table and one word to the output I/O image table.
SW 3.4 through SW 3.8 enable or disable the datalinks.
Description
A datalink is a type of pointer used by some SCANport products to
transfer data to and from the controller. Datalinks allow a parameter
value to be changed without using a block transfer message. When
enabled, each datalink consumes two 16-bit words in both the input
and output image table of the controller. When SW3.8 is ON, the last
datalink is truncated so that it uses only one word in the input and
output image table.
SCANport
Module
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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1
1
1
SCANport Product
Message Handler
Logic Command
Reference
Data In A1
Data In A2
Data In B1
Data In B2
Data In C1
Data In C2
Data In D1
Data In D2
Message Handler
Logic Status
Feedback
Data Out A1
Data Out A2
Data Out B1
Data Out B2
Data Out C1
Data Out C2
Data Out D1
Data Out D2