Block transfers – Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual User Manual
Page 67
4–11
Communications Overview
Publication 2711-6.0
Remote I/O links allow the transfer of blocks (up to 64 words)
between a PLC and a PanelView terminal. Block transfers are
assigned to a single byte of input data (module control byte) and
output data (module status byte) in the PanelView rack. These two
bytes control the operation of the block transfer and are no longer
available for discrete I/O.
The status and control byte always occupy the low byte of the lowest
module group in the PanelView rack assignment. For example, if the
starting module group is 0:
Rack 03
PanelView I/O
0
2
4
6
1
3
5
7
Starting Module
Group 0
Input Word
Output Word
Status Byte
Module Control Byte
0
1
2
3
4
5
6
11
12
13
14
15
16
17
7
10
0
1
2
3
4
5
6
11
12
13
14
15
16
17
7
10
No matter how many block transfers are assigned (1 to 10), only one
byte is reserved in the input rack and one in the output rack.
Block transfer directions are in reference to the PLC:
•
Block Transfer Reads (BTR) are inputs to the PLC and transfer
data from control devices such as push buttons on the PanelView.
•
Block Transfer Writes (BTW) are outputs from the PLC and
transfer data to indicators such as bar graphs on the PanelView.
Block Transfer Write
Block Transfer Read
PLC
PanelView Terminal
Block Transfers