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Hey there Contractors and fellow Service Professionals!
Today we are covering the Allen Bradley 1785-L80B Series E PLC. This is a PLC 5/80 Controller with 100K words SRAM user memory.
This programmable controller is another central part of each control system based on the PLC 5 series. It connects local, extended, and remote I/O modules on various communication interfaces into one control system. There are four built-in ports available for this controller. The ports are marked as channel 1A, channel 1B, channel 2A, and channel 2B.
The I/O scan time per rack are 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, and 3 ms at 230.4 mbits/s. On the front panel of the 1785-L80B controller is a 25-pin connector marked channel 0. Channel 0 supports ASCII and DF1 full-duplex and half-duplex master and half-duplex slave protocols.
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Let’s look at the Specs…
| Allen Bradley 1785-L80B Series E | |
|---|---|
| Max User Memory | 100K Words |
| Max Total I/O | 3072 any mix or 3072 in + 3072 out (complement) |
| Max Analog I/O | 3072 |
| Communication Ports (Channels) | 4 DH+/Remote I/O |
| Max Total Number of I/O Chassis | 93 (93 Universal Remote & 1 RS-232-C/422-A/423-A Ports) |
| I/O Scan Time/Rack | 10 ms at 57.6 kbits 7ms at 115.2 kbits |
| Backplane Current Load | 3.3 A at 5 V |
| Power Dissipation | 17.3 W |
The maximum cable length for DH+ depends on the transmission rate. It is imperative that all devices on a DH+ link communicate at the same rate. The length goes from a maximum 3048 m for speed 57.6 Kbits/s to 762 m for a speed of 230.4 Kbits/s.
Allen Bradley 1785-L80B PLC 5/80 processors are available for applications from small scale equipment to entire production lines.
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Stay tuned for the next PLC item on our line up >> Allen Bradley 2711P-RDT10C/B
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