I/O
Chassis-Based
1771 Universal I/O
The 1771 Universal modular product line provides a full range of I/O for a wide variety of applications. These modules can be used in a processor-resident local I/O chassis of a PLC-5 controller, at a location remote from the processor in an I/O chassis with a 1771-ACN15 or -ACNR15 I/O adapter on a ControlNet link with the processor, or at a location remote from the processor in an I/O chassis with a 1771-ASB I/O adapter on a Universal Remote I/O link with the processor. With 1771 I/O, you do not need to disconnect wiring to replace a module due to its Removal & Insertion Under Power (RIUP) features. For some modules, wiring arms are shipped with I/O modules and, with others, remote termination panels are available. 1771 I/O also include optical coupling and filter circuitry for signal noise reduction.
PLC-5 I/O
- 512 thru 3,072 maximum forcible I/O in any mix
- Up to 50,176 maximum non-forcible I/O
- Processor-resident local I/O (1771 I/O modules)
- Extended-local I/O on selected processors (1771 I/O modules)
- Universal remote I/O (1746, 1771, 1794, 1797 I/O modules; 1791D and 1792D I/O blocks)
- DeviceNet I/O (1734, 1769, 1790, 1794, 1797 and 1798 I/O modules; 1791D and 1792D I/O blocks)
- ControlNet I/O on selected processors (1771, 1746, 1794, 1797 I/O modules)
Networking
- EtherNet
- ControlNet
- DeviceNet
- Data Highway Plus
- RS-232-C,422-A,423-A
- Universal Remote
ControlNet Backup System
- In systems that use a ControlNet link for I/O communication, hot backup capability can be established with two ControlNet PLC-5 processors and 1785-CHBM hot-backup memory cartridges.
- The ControlNet PLC-5 backup system helps increase the fault tolerance of Allen-Bradley PLC-5 programmable controller systems that use a ControlNet link for I/O communication by providing backup of the PLC-5 processor used in the systems.
- Each PLC-5 processor with its own hot-backup memory cartridge (1785-CHBM) installed is located in its own local 1771 I/O chassis with its own power supply. Communication across the ControlNet link keeps the secondary PLC-5 processor updated. Upon detection of a fault, control of the ControlNet link switches from the primary PLC-5 processor to the secondary PLC-5 processor.