Product image is representative; revision or series may vary. Contact us to request a specific version.
1785-L20C
The 1785-L20C processor module is an industrial ControlNet processor module from Allen-Bradley/Rockwell Automation. It has been designed and manufactured as part of the Allen-Bradley PLC 5 controller series. The 1785-L20C ControlNet processor module is one of the key components in a complete PLC 5 control system. It supports battery backup and it is made to be installed in an I/O chassis. The 1785-L20C ControlNet processor module supports up to 512 analog I/O or up to 512 I/O of any kind.
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Technical specifications for 1785-L20C
| Manufacturer | Allen Bradley |
|---|---|
| Category | PLCs |
| Product Line | PLC 5 |
| Part Number | 1785-L20C |
| Weight | 3.25 lbs (1.47 kg) |
| Module Type | ControlNet Processor Module |
| Program Scan Time | Typical 2 ms/Kword, Bit Logic 0.5 ms/Kword |
| Max Total I/O | 512 (any mix) or 512 in + 512 out (complementary) |
| Max MCPs | 16 |
| Serial Port | Yes |
| Coprocessor Port | Yes |
| Max Analog I/O | 512 |
| I/O Scan Time Per Rack | 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s |
| Max I/O Chassis Total | 13 |
| Max I/O Chassis Extended Local | 0 |
| Max I/O Chassis Universal Remote | 12 |
| RS-232-C/422-A/423- A Ports | 1 |
| Control Coprocessor Expansion Port | Yes |
The Allen-Bradley 1785-L20C PLC-5 is a ControlNet programmable controller and processor. It ships with a tray containing several tools for installing the processor, including a 1770-XYC lithium battery, 1 battery cover with a screw, 2 keys, 4 150-Ohm terminating resistors, 2 82-Ohm terminating resistors, 1 DIN rail connector cover, 2 3-pin connectors, and 1 1784-CP7 cable adapter. When installing the 1785-L20C PLC-5 processor, use an approved ground point, avoid touching the connector pins and the backplane connector, and keep the processor in its static-shielded container when it is not in use to avoid electric shock and damage to the processor.
The 1785-L20C has a red battery indicator light, a red/green RUN/FAULT indicator light, an amber force indicator light, a red/green ControlNet I/O indicator light, the red/green Channel 2 indicator light, and a red/green ACTIVE/FAULT Channel 0 Communication indicator light on the front panel. Its front panel also has space for memory modules, a battery compartment, a key switch for selecting the processor’s mode, and multiple channel ports.
The 1785-L20C is designed to work in an I/O chassis. Ensure that the chassis power is switched off before installing or removing the PLC-5 processor.
The 1785-L20C has a serial port, a coprocessor port, and a control coprocessor expansion port. It can support up to 512 of any I/O and 512 analog I/O. Its typical scan time is 2 ms per keyword and its I/O scan time per rack is 10 ms at 57.6 kbit/s, and it is 7 ms at 115.2 kbit/s. The 1785-L20C can support up to 16 MCPs.
| Revision Part # | Also known as | |
|---|---|---|
| 1785-L20C Ser A | 1785-L20C/A, Series A, Rev A | |
| 1785-L20C Ser B | 1785-L20C/B, Series B, Rev B | |
| 1785-L20C Ser C | 1785-L20C/C, Series C, Rev C | |
| 1785-L20C Ser D | 1785-L20C/D, Series D, Rev D | |
| 1785-L20C Ser E | 1785-L20C/E, Series E, Rev E | |
| Don't see your particular revision? Contact us now. | ||
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- 1785L20C
- 1785L2OC
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- 17B5L20C
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Allen Bradley PLC 5 ControlNet Processor Module, 512 Max Total I/O, 16 Max MCPs, Serial Port, Coprocessor Port