1747-L20G
The Allen-Bradley 1747-L20G is a SLC 500 Fixed Controller. This Fixed Controller has (12) 24 V DC Sink Inputs, 8 DC Transistor Source Outputs and 24 Volts DC Line Power.
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4.9
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Allen Bradley SLC 500
The SLC 500 programmable controller series combines power with flexibility by offering a wide range of communication configurations, features, and memory options at an affordable price. The controllers utilize ladder-logic and structured-text programming to provide exceptional productivity and a smooth user interface. The broad selection of I/O modules, along with Ethernet, DH+, DH-485, ControlNet, and DeviceNet communication capabilities, makes SLC 500 controllers some of the most versatile on the market. Additionally, the SLC 500 series boasts an advanced instruction set, including file handling, sequencer, diagnostic, shift register, immediate I/O, and program control instructions. The modularity of the series offers many customization and configuration options, including but not limited to: adding I/O, memory, or communication interfaces. The SLC 500 modules even include backup options for increased fault tolerance via the ControlNet Hot Backup module or the PLC-5 Backup Communication module. If you are looking for a programmable controller that seamlessly combines power, flexibility, and affordability, then the SLC 500 series is for you.
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Browse available units in our catalog of SLC 500.
1747-L30P
The Allen-Bradley 1747-L30P is a SLC 500 Fixed Controller. This Fixed Controller has (18) 240 V AC Inputs, 12 AC Triac Outputs and 120/240 Volts AC Line Power.
Available
4.8
1747-L20R
The Allen-Bradley 1747-L20R is a SLC 500 Fixed Controller. This Fixed Controller has (12) 240 V AC Inputs, 8 AC/DC Relay Outputs and 120-240 Volts AC Line Power.
In Stock Ships Today
5.0
1746-RT25R
The Allen-Bradley 1746-RT25R is a SLC 500 Removable Terminal Block. This Removable Terminal Block has 16 I/O points and 18 Terminals with Gold Contact Plating.
In Stock Ships Today
4.9
SST-PB3-SLC
This module features compatibility with the SLC 500 interface card and provides a data input capacity of up to 244 bytes per slave. Its operational temperature ranges from 0°C to 50°C, while storage t
Available
4.7
1746-RT26
The Allen-Bradley 1746-RT26 is a SLC 500 Removable Terminal Block. This Removable Terminal Block has 2 Terminals and Gold Contact Plating.
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4.7
MVI46-HART
With support for up to 15 devices per port, this communication module is capable of functioning efficiently in multi-drop environments. The module uses an RJ45 Type configuration port and operates on
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4.7
1747-L30D
The Allen-Bradley 1747-L30D is a SLC 500 Fixed Controller. This Fixed Controller has (18) 24 V DC Sink Inputs, 12 AC Triac Outputs and 120/240 Volts AC Line Power.
In Stock Ships Today
4.9
1746sc-CTR4
The 1746sc-CTR4 Counter Input Module is used with the Rockwell Automation SLC 500 series and has a 1.75 W max. Power Dissipation.
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4.7
1747-L20F
The Allen-Bradley 1747-L20F is a SLC 500 Fixed Controller. This Fixed Controller has (12) 24 V DC Sink Inputs, 8 AC/DC Relay Outputs and 24 Volts DC Line Power.
Available
4.7
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About SLC 500
The SLC 500 series is a series of Allen-Bradley programmable logic controllers that are used for a wide variety of applications. The SLC 500 series features Ladder-Logic with a structured text programming. The units are designed for addressing a broad range of applications that include file handling, sequencer, diagnostics, shift register, and immediate I/O and program control instruction applications. The SLC 500 controllers support built-in RS-232, 422, and 423 communication ports. The unit also comes with the DeviceNet and the ControlNet I/O on the selected processors. The SLC 500 series provides controllers that have powerful and affordable performance. These units are designed and built to provide excellent value.
The Allen-Bradley SLC 500 controllers feature modular processes, power supplies, I/O devices, memory options, and communication interfaces that allow the units to have configurable and expandable systems. The units feature an advanced instruction set that includes indirect addressing and a high level of performance capability for delivering computation instructions. The units are programmed to provide the users with a broad selection of the I/O devices. Therefore, the users can select from over 60 modules that help to control the discrete, analog, and temperature signals. The SLC 500 controllers are designed to deliver power and flexibility with a wide range of communication configurations. The SLC 500 modular hardware style controllers allow for the section of the processor, power supply, and I/O modules. The units also come with optional memory modules that provide a non-volatile memory in a convenient modular form. When using the commercial PROM programmers for programming and erasing the memory module, adapter sockets are required.
SLC 500 troubleshooting
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Ensure the card is slid into the rack allowing both bottom and top clips to lock into place
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Check that the entire rack has power
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Allow a 1-5 min power cycle
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Check pins on the back side of the card where a connection is made into the rack
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Take the card out and do a visual inspection of the card outside of the rack, checking that resistors, capacitors, TRIACs and chips all look functional
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Check to see that power supply is screwed into the rack and properly mounted
Processor Communications
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Make sure your RS-232 cable is making a good connection with both the computer and processor
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Check that the proper COMM port and driver is being used in RS-Linx
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For SLC 5/03 and up apply screwdriver across GND and VBB for 1 min, this will reset COMMS
Read I/O configuration
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Check to ensure you are reading the correct driver in rs-linx
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Research error codes
Rack not powering on
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Check power supply
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Try inserting power supply into another rack
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Check voltage going into power supply and ensure correct sumpers are selected if there any
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Check pins on the back slide of the power supply that plug into the rack
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Check manual for proper insulation and power requirements for multiple power supplies
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Add your amperage rating for each device
If the rack is still not powering on, the application you are using could require more amperage than the supply is rated for
Example:
The 1747-L551 draws 1A at 5v DC
The 1746-OV16 requires 0.270 A according to documentation
The 1746-P2 supplies 5A at 5vDC to the backplane
Checking to see if our power supply can handle the load we would use the following formula:
IT=I1+I2+I3
Using this formula, we can see that since 1a + .27a = 1.27a ,
the 1746-P2 would handle this load no problem
If none of these solutions solve the problem, there could be a faulty card killing your whole rack
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Remove each card one at a time to check if there is a card causing issues in the rack