Allen-Bradley 1747-ASB - 1747-ASB Module 1 I;O Mapping Details

Publication 1747-UM006B-EN-P - June 2003
Application Examples 8-21
1747-ASB Module 1 I/O Mapping Details
Because 1747-ASB module 1 is configured for 2-slot addressing, has
eight logical groups and 16 I/O slots available, all of the slots present
are mapped into the PLC-5/40 image. No extra slots in the chassis or
extra words in the image remain. Each slot is assigned one byte in the
PLC-5/40 input and output images.
1747-ASB module 1 is configured for block transfer specialty I/O
mode. Therefore, all specialty I/O modules are block transfer mapped.
If specialty I/O modules are used, their paired slots can only use
8-point (or smaller) discrete input, discrete output, or block transfer
mapped specialty modules, as shown below. 16-point discrete output
modules can be used if their paired slots have discrete (16-point or
less) input modules in them, as shown below. 32-point modules
cannot be used with 2-slot addressing.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
ASB 1
1746-NIO4V 1746-OW8 1746-OW16 1746-IA16 1746-OG16 1746-IG16 1746-OW8 1746-OV8 1746-OB16 1746-IB16 1746-OA8 1746-NO4V 1746-OW16 1746-IA16 1746-OV16 1746-IV16
Slot Pair
123 4 6 785
Bit Number Octal
Logical
Rack 1
071017
Logical
Rack 2
PLC Processor Input Image
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
1747-ASB
Module 1
NIO4V
IA16IA16
IG16 IG16
Bit Number Octal
Logical
Rack 1
071017
Logical
Rack 2
PLC Processor Output Image
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
IB16 IB16
NO4V
IA16IA16
IV16IV16
Not Used
Not Used
1747-ASB
Module 1
NIO4V
OW16OW16
OG16 OG16
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
OB16 OB16
NO4V
OW16OW16
OV16OV16
Not Used
Not Used
OW8
OV8 OW8
OA8
I:010
I:01 1
I:012
I:013
I:014
I:015
I:016
I:017
I:020
I:021
I:022
I:023
I:024
I:025
I:026
I:027
O:010
O:01 1
O:012
O:013
O:014
O:015
O:016
O:017
O:020
O:021
O:022
O:023
O:024
O:025
O:026
O:027
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