Allen-Bradley 1785-L20B PLC-5/20 Controller

Description:

The 1785-L20B is a PLC-5/20 Processor by Allen-Bradley, featuring 16K Word SRAM memory. This controller falls under the PLC 5 Programmable Controller category, designed for various industrial applications.

Key Specifications:

Maximum User Memory Words: 16K
Total I/O Maximum (Any Mix): 512
Total I/O Maximum (Complimentary): 512 inputs + 512 outputs
Communication Ports:
- 1 DH+ (Fixed)
- 1 DH+/Remote I/O (Adapter or Scanner)
- 1 serial port (configurable for RS-232, 423, RS-422A)
Maximum Number of I/O Racks (Rack Addresses): 4 (0-3)
Maximum Number of I/O Chassis (Total): 13
Maximum Number of I/O Chassis (Remote): 12

Additional Information:

Battery-backed static RAM
EEPROM program backup option using 1785-ME16, -ME32, -ME64, and -M100
512 Analog I/O
I/O Scan Time:
- 10 ms @ 57.6 kbit/s
- 7 ms @ 115.2 kbit/s
- 3 ms @ 230.4 kbit/s
1 DH+ and 1 DH+/Remote I/O Channels
RS-232-C/422-A/423-A Configurable Serial Port
Backplane Current Load @ 5V: 3.3 A

Miscellaneous:

The Allen-Bradley 1785-L20B PLC-5 processors are single-slot modules for 1771 I/O chassis, offering diverse I/O, memory, and communication options. These processors include Data Highway Plus and RS-232-C/422-A/423-A communication ports. Additionally, Ethernet PLC-5 processors have an Ethernet port, and ControlNet PLC-5 processors feature a ControlNet port.