Rockwell Automation 1747-ASB Remote I/O Adapter - Manual (Page 75)

Publication 1747-UM006B-EN-P - June 2003
Configuration 4-21
If the invalid switch setting is selected, a 1747-ASB module error
occurs.
1/2-slot addressing is not supported by the PLC-2 family of processors.
Specialty I/O Mode (SW3-7)
SW3 switch 7 determines the specialty I/O mode (discrete or block
transfer).
Specialty I/O Mode DIP Switch Settings
The 1747-ASB module is shipped from the factory with the default
position ON (discrete).
For an overview of discrete and block transfer modes, refer to page
3-13.
I/O Module Keying (SW3-8)
SW3 switch 8 provides I/O module keying, that prevents you from
operating the 1747-ASB module when the I/O module or DIP switch
configuration (other than the keying DIP switch itself) differs from the
last time you saved it. There are two modes, save and check.
When power is applied in save mode and the DIP switch and I/O
module configurations are valid, the 1747-ASB module saves the DIP
switch and I/O module configuration in non-volatile memory.
When power is applied in check mode, the 1747-ASB module
compares the stored DIP switch and I/O module configuration to the
current DIP switch and I/O module configuration. If the
configurations do not match, a 1747-ASB module error occurs.
SW3
Discrete
4
1
23
5
6
7
8
O N
SW3
Block Transfer
4
1
23
5
6
7
8
O N
4
1
23
4
5
6
7
8
SW1
S
W2
SW3
1
23
5
6
7
8
1
23
4
5
6
7
8
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