Rockwell Automation 1771-IL/B , D17716.5.91 ISOLATED ANALOG INPUT Module User Manual
Page 59
Block Transfer (Mini–PLC–2 and
PLC–2/20 Processors)
Appendix D
D-2
Rungs 2 and 3: These output energize instructions (012/01 and 012/02) define
the number of words to be transferred. This is accomplished by setting a binary
bit pattern in the module’s output image table control byte. The binary bit
pattern used (bits 01 and 02 energized) is equivalent to 6 words or channels, and
is expressed as 110 in binary notation.
Rung Summary: Once the block transfer read operation is complete, the
processor automatically sets bit 07 in the input image table status byte and
stores the block length of the data transferred.
Figure D.1
Multiple GET Instructions (Mini-PLC-2 and PLC-2/20 Processors Only)
Data Table
07
1
R
Control
Byte
010
012
017
027
030
060
065
110
112
117
130
Output Image Table Control
Byte Contains Read
Enable Bit and Block
Length in Binary Code
Data Address
Contains Module
Address in BCD
Input Image Table
Status Byte
Contains Done Bit
Storage Location
Contains File
Address in BCD
R = Read 07 = Bit
1
2
0
07
1
R
Status
Byte
0
6
0
Output
Image Table
Timer/Counter
Accumulated
Values Area
Input
Image
Table
Timer/Counter
Preset
Values Area
First Address,
Destination of
Transferred Data
12172
113
02
012
07
G
G
012
01
012
02
030
130
120
060
Rung 1
Rung 2
Rung 3
Multiple GET Instructions