Allen-Bradley 1771-ASC

The remote I/O adapter module serves as an interface between remote I/O modules and programmable controllers. The remote I/O adapter: - transmits data up to 10,000 cable-feet (at 57.6K baud)

- provides faster backplane scanning and data transmission up 2500 cable-feet at 230.4K baud
- receives/sends data from/to the I/O scanner in serial form
- reads/writes data from/to the input modules in parallel form
- reads/writes data from/to the output modules in parallel form
- supports any mix of I/O (4, 6, 8, 16 or 32 points)
- supports three methods of I/O addressing; 1/2-slot, 1-slot and 2-slot
- checks I/O configuration on power-up to verify I/O module placement


Programmable controllers that use the 1771-ASC remote I/O adapter module can address their I/O in 2-slot, 1-slot or 1/2 slot I/O groups. These three addressing methods are referred to as 2-slot addressing, 1-slot addressing and 1/2-slot addressing. You select the addressing method with switch 5 and 6 in the I/O chassis backplane switch assembly. You make this selection for each chassis independently with only one method of addressing for each chassis.