- Bad communication ports
- Broken selector/key switches
- Dead batteries/Bad Battery connections
- Solid or Blinking RED OK Status Light
- Solid or Blinking RED RUN Status Light
- Solid or Blinking RED Fault Status Light
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+1 (919) 205-4392
Allen Bradley PLC 3 Repair
We offer extensive repairs for your PLC 3. We keep many spare parts in stock so that we can repair your PLC 3 as efficiently and effectively as possible. Our standard repair lead time is 2-4 weeks. However, we can often repair your unit much faster if necessary. We can repair most issues with your PLC 3 and if for some reason we cannot repair your unit we will do our best to offer a refurbished unit at the repair cost, so that you can get a working unit back as soon as possible!
- 2 Year DO Supply Warranty
- Fast repairs at low costs
- No surprises or up-charges for difficult repairs
- Standard lead time of 2-4 weeks
- Extensive quality control and testing
Get a repair quote
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's
warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Hardware issues & error codes we repair
We repair all of the following hardware issues and error codes with your PLC 3 parts.
- Bad analog inputs or ouptus
- Bad digital input or outputs
- Bad relays (stuck on/off)
- Incorrect voltages on inputs or outputs
- Incorrect current on inputs or outputs
- DF1, DH-485, DH+, Profibus, Remote I/ (RIO) failures and more!
- Intermittent communication
- Solid RED/Blinkging RED communication lights
- Devicenet, Ethernet, ControlNet, RS232 ports.
- Missing CJC Jumpers
- Incorrect readings
- Failed inputs
- Dead power supplies
- Incorrect voltage
- Broken Plastic
- Poor Connections
- Bad Slots
Browse PLC 3 Repairs
Browse our catalog of repairable PLC 3 parts to get a quote.
1775-MC8
This memory module is compatible with PLC 3 controller systems and features a capacity of 32K words. It can operate in temperatures from 32 to 104 degrees Fahrenheit and is suitable for conditions whe
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1775-ME4
This memory module utilizes Random Access Memory (RAM) technology and operates on a 5-volt DC supply sourced from the backplane. It incorporates a lithium manganese dioxide battery with a capacity of
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1775-ME8
This memory module utilizes single-bit error detection and employs an access method managed by the processor. The 1775-ME8 supports battery backup using a 3.0 V lithium battery, ensuring data integrit
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1775-ME8A
This memory module operates within a temperature range of 0 to 60 degrees Celsius for normal use and can be safely stored at temperatures up to 85 degrees Celsius. It is compatible with both the 1775-
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1775-ME8B
This RAM module features a 32K memory capacity and utilizes automatic error correction to maintain data accuracy. It operates effectively in temperatures from 0°C to 60°C and can be stored in a temper
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1775-MEA
This memory module operates at a communication rate of 10 milliseconds per 1K words and fits into one slot in the PLC-3 main. It requires a backplane current of 3.5 A and functions at an input voltage
In Stock Ships Today
1775-MEAA
This memory module is compatible with Allen Bradley's PLC 3 system and offers a total RAM capacity of 64K words. It supports error correction and operates effectively between 0 degrees Celsius and 40
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1775-MED
With its chassis mounting method, the 1775-MED error-correcting RAM module is equipped with a rechargeable nickel-cadmium battery rated at 3.6 volts. It provides interfaces through RS-232-C or RS-422-
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1775-MEDA
Designed as a spare part, this memory module supports both error detection and correction. It fits into a single slot and offers a choice between lithium or nickel battery backup options. This module
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1775-MEDB
This module integrates several indicators for battery status and memory errors, enhancing reliability during operation. It operates effectively within a range of 0 to 60 degrees Celsius and supports a
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