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The Allen-Bradley 1771-ASB Remote I/O Adapter Module physically resides in a Universal I/O Chassis, and acts as a slave in an Allen Bradley subnet in an EPICS control system. The 1771-ASB Remote I/O Adapters are linked via subnet connection to other Remote I/O Adapters in Allen Bradley 1771 Series I/O Chassis, Allen-Bradley RediPANEL Pushbutton Modules, and back to a VMEbus I/O scanner. They correspond to the ADAPTER number when configuring an Allen-Bradley subnet. An Allen-Bradley / EPICS subnet allows for up to 8 adapters to be located on one Allen-Bradley subnet link.
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
- scans all slots in the chassis, or all but the last four slots, allowing improved scan time and I/O image space savings. Slot power supplies can be used in the last quarter of the rack without using I/O space.
- can emulate series B adapters, providing system response similar to the 1771-ASB series B. This allows use of 1771-S4A and -S4B scanners which require slower response for proper operation.
Inquiry - 1771-ASB
