Publication 1747-UM006B-EN-P - June 2003
4-12 Configuration
The following examples illustrate how the selection of the 1747-ASB
image size is determined by:
• the addressing mode (2-slot, 1-slot, 1/2-slot)
• the number of chassis slots required
41 234567 8
SW1 SW2 SW3
1 23 5678 1 2345678
O
N
O
N
O
N
Specialty I/O Mode
I/O Module Keying
Addressing Mode
Last Chassis/PLC-3 Backup
Link Response
Processor Restart Lockout
Hold Last State
Baud Rate
Primary/Complementary Chassis
ASB Module Image Size
Logical Group Number
Logical Rack Number
ON
OFF
Reserved
Using 1-slot addressing and a 7-slot chassis, six
slots are available for I/O modules. To map all
six slots into the scanner image, the 1747-ASB
module image size must be 6 logical groups.
1-Slot Addressing With Six Slots Available
1747-ASB Module
01234 5 6Slot Number
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
1747-ASB Module
0123 456Slot Number
Group 0,1
Group 2,3
Group 4,5
Group 6,7
Group 8,9
Group 10,11
789
Group 12,13
Group 14,15
Group 16,17
10
Group 18,19
Using 1/2-slot addressing and a 4-slot chassis
attached to a 7-slot chassis, ten slots are
available for I/O modules. To map all ten slots
into the scanner image, the 1747-ASB module
image size must be 20 logical groups.
If an image size of 16 logical groups is
chosen, slots 9 and 10 are unused. If an I/O
module is installed in slots 9 or 10, the
1747-ASB module ignores it unless the I/O
module faults.
1/2-Slot Addressing With Ten Slots Available
Using 2-slot addressing and a 10-slot chassis,
nine slots are available for I/O modules.
Selecting 4 logical groups leaves slot 9 unused.
If an I/O module is in slot 9, the 1747-ASB
module ignores it, unless the I/O module faults.
Selecting 6 logical groups leaves an unused
logical group in the 1747-ASB module image.
The image normally assigned to slot 10 can be
used by slot 9 (providing one full word).
2-Slot Addressing With Nine Slots Available
012 3 456Slot Number
Group 0
Group 1
Group 2
Group 3
Group 4
789
012 3 4 56Slot Number
Group 0
Group 1
Group 2
Group 3
789
1747-ASB Module
1747-ASB Module
4 Logical Groups
6 Logical Groups
Group 5
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