Welcome to our site Electrical Engineering Equipment Company. Don"t forget to bookmark this page Allen Bradley Circuit. If you found what your looking for, please remember to click an appreciation button above for this page.
 Allen Bradley A-B Motor Protection Circuit Breaker 80A Amp140M-I8E-C80 A 140M-I8 US $350.00 
|
 ALLEN BRADLEY 2-POLE 4A CIRCUIT BREAKER 1492-CB2 G040 *LOT OF 7* US $43.75
|
 Allen Bradley Circuit Breaker 1492-GHD020 F #5351 US $69.99
|
 Allen Bradley 140U Circuit Breaker US $175.00
|
 ALLEN BRADLEY SINGLE POLE 2A CIRCUIT BREAKER 1492-CB1 H020 *LOT OF 25* US $135.99
|
 ALLEN BRADLEY CIRCUIT BREAKER 1492-CB2 ~ QTY OF 3 Used US $16.96
|
 ALLEN BRADLEY CIRCUIT BREAKER 1492-CB3 ~ QTY OF 6 ~ Used US $59.96
|
 Allen Bradley 1492 CB1 G040 Circuit Breaker US $20.00
|
 Allen Bradley 1492 CB1 G020 Circuit Breaker US $15.00
|
 ALLEN BRADLEY 1492-CB1 CIRCUIT BREAKER 20A 1P NIB!! US $25.00
|
 ALLEN BRADLEY 140M-C2T-A63 CIRCUIT BREAKER New US $32.96
|
 NEW IN BOX ALLEN-BRADLEY CIRCUIT BREAKER 1492-MCAA250 US $15.75
|
 ALLEN BRADLEY 1492-CB2 G 050 CIRCUIT BREAKER, NIB US $29.99
|
 Allen Bradley Circuit Breaker 1492-GS2G100 10A 2P No Contact (5775) US $38.28
|
 Allen Bradley Circuit Breaker 1492-SP2C100 2P C-Curve 10 Amp (5870) US $34.99
|
 Allen Bradley Circuit Breaker 1492-SP2C040 2P C-Curve 4 Amp (5869) US $34.99
|
 Allen Bradley Circuit Breaker 1492-CB2G020 2P 2A 480V (5773) US $44.88
|
 New Allen Bradley Circuit Transformer 1497-N16 B 130VA US $41.00
|
 NEW ALLEN BRADLEY 1489-A1D015 CIRCUIT BREAKER US $55.00
|
 ALLEN BRADLEY 1492-CB2H160 CIRCUIT BREAKER 16A ***NIB*** US $77.00
|
 ALLEN BRADLEY 1497-N8 CONTROL CIRCUIT TRANSFORMER NNB!! US $125.00
|
 NEW ALLEN BRADLEY 1492-SP1D080 CIRCUIT BREAKER US $30.00
|
 NEW ALLEN BRADLEY 1499-A2C015 /A CIRCUIT BREAKER US $110.00
|
 Allen Bradley 1497-N11 CONTROL CIRCUIT TRANSFORMER S. A US $54.09
|
 ALLEN BRADLEY 1492-ACB W/ 1492-CB3 4 POLE CIRCUIT BREAK US $26.00
|
 ALLEN BRADLEY 1492-CB2H060 CIRCUIT BREAKER 6A ***NIB*** US $33.00
|
 ALLEN BRADLEY 1497-N27 CONTROL CIRCUIT TRANSFORMER, PRI: 220V SEC: 120V, NIB US $79.99
|
 (#402) Allen Bradley Circuit Breaker 1492-CB2H100 NIB US $29.00
|
 Allen Bradley H200 20 Amp Circuit Breaker (CIR1339) US $30.00
|
 ALLEN BRADLEY CIRCUIT BREAKER, CAT: 1492-CB2, HP100, 10 A, 3 HP US $25.00
|
 ALLEN BRADLEY 1492-CB1G070 SERIES B CIRCUIT BREAKER, NIB US $19.99
|
 ALLEN BRADLEY 1492-CB1G020 SERIES C CIRCUIT BREAKER NIB US $19.99
|
 ALLEN BRADLEY 1492-CB1G020 SERIES B CIRCUIT BREAKER NIB US $19.99
|
 ALLEN BRADLEY 3-POLE 10A CIRCUIT BREAKER 1492-CB3 G100 *LOT OF 7* US $125.99
|
 New Allen-Bradley 1492-CB2H070 Circuit Breaker US $30.00
|
 ALLEN BRADLEY 1492-CB1G040 SERIES B CIRCUIT BREAKER, NIB US $19.99
|
 ALLEN BRADLEY CIRCUIT BREAKER, CAT: 1492-CB3, H250, 25 AMP, 15 HP US $30.00
|
 Allen-Bradley Miniature Circuit Breaker 1492-GH040 4Amp. 65V NEW US $19.99
|
 Allen-Bradley Miniature Circuit Breaker 1492-GH100 10 Amp. 65V NEW US $19.99
|
 ALLEN BRADLEY 140U-H6C3-C20-MB SERIES B MOLDED CASE CIRCUIT BREAKER, 3 POLE NEW US $759.99
|
 ALLEN BRADLEY 140U-H6C3-C20-MB SERIES B MOLDED CASE CIRCUIT BREAKER, 3 POLE US $399.99
|
 New Allen-Bradley 1492-CB3H150 Circuit Breaker US $25.00
|
 ALLEN BRADLEY 1492-CB1G100 SERIES B 10A CIRCUIT BREAKER, NIB US $19.99
|
 Allen Bradley 100-C09Z*10 Circuit Breaker for Control Panel US $16.99
|
 ALLEN BRADLEY 1492-GHD030 CIRCUIT BREAKER 2P 3A NEW US $65.00
|
 ALLEN BRADLEY 1492-GHD020 CIRCUIT BREAKER 2P 2A NEW US $65.00
|
 Allen Bradley Circuit Breaker 4amp 1492-CB1G040 (#407) US $15.00
|
 (#408) Allen Bradley Circuit Breaker 6amp 1492-CB1G060 US $15.00
|
 Allen-Bradley Circuit Breaker Type 140M-18 3-Poles NEW US $49.99
|
 Allen Bradley 42185-800-01 Control Circuit Breaker US $299.99
|
 LOT OF 2 ALLEN BRADLEY CIRCUIT BREAKERS 1492-CB1G070 7AMP NEW US $14.99
|
 Qty 20- Allen Bradley AB 1492-CB1 Single Pole Circuit Breakers (1 Amp to 15 Amp) US $19.99
|
 Allen Bradley 1494V-M60 Circuit Breaker Mechanism US $29.95
|
 ALLEN BRADLEY CIRCUIT TRANSFORMER .130 KVA 1497-N17 B US $97.50
|
 ALLEN-BRADLEY 1497-E-BASX-0-N CONTROL CIRCUIT TRANSFORMER, 240/480 TO 120V, NIB US $84.76
|
 ALLEN BRADLEY 140U-QTD3-D50 500 AMP CIRCUIT BREAKER US $2,500.00
|
 Allen-Bradley 1492-CB1 circuit breaker 6A G060 US $12.99
|
 ALLEN BRADLEY 1492-CB2G050 SERIES C CIRCUIT BREAKER 5AMP 277V 1 1/2 HP NEW US $38.89
|
 ALLEN BRADLEY 1492-CB2G050 SERIES C CIRCUIT BREAKER 5AMP 277V 1 1/2 HP US $23.33
|
 1 NEW ALLEN BRADLEY 1492-CB-3-H-100 CIRCUIT BREAKER O4-5 US $70.00
|
 2X NEW ALLEN BRADLEY 1492-SPU1B010 CIRCUIT BREAKER US $49.00
|
 ALLEN BRADLEY 140U-K6D3-D40-A CIRCUIT BREAKER MCCB 65KA/480V 400 AMP 3-POLE US $1,799.99
|
 *NEW* Allen Bradley 1492-GS3G200 /A Circuit Breaker 20A *60 DAYS WARRANTY!* US $109.81
|
 NIB ALLEN BRADLEY CIRCUIT BREAKER 15A, 1492-CB1G150 US $39.97
|
 ALLEN BRADLEY 1492-CB3G150 MINIATURE CIRCUIT BREAKER, SERIES B, 30 AMP, NIB US $72.16
|
 ALLEN BRADLEY 16A SINGLE POLE CIRCUIT BREAKER G160 1492-CB1 SERIES B *LOT OF 25* US $99.99
|
 ALLEN BRADLEY # 1497-N16 CONTROL CIRCUIT TRANSFORMER US $48.00
|
 NIB ALLEN BRADLEY 1497-N40 CONTROL CIRCUIT TRANSFORMER US $225.00
|
 ALLEN BRADLEY 1492-CB1G070 CIRCUIT BREAKER 7 AMP 1 POLE US $7.00
|
 ALLEN BRADLEY 1492-CB1G030 CIRCUIT BREAKER 3 AMP 1 POLE US $7.00
|
 2X NEW ALLEN BRADLEY 1492-SPU1B150 CIRCUIT BREAKER US $49.00
|
 ALLEN BRADLEY 1492-CB1G100 CIRCUIT BREAKER 10 AMP 1 p US $7.00
|
 2X NEW ALLEN BRADLEY 1492-SPU1B020 CIRCUIT BREAKER US $49.00
|
 ALLEN BRADLEY CIRCUIT BREAKER 1492-CB3H050 SER B 5 AMP US $60.00
|
 ALLEN BRADLEY CIRCUIT BREAKER 1492-CB3H050 (LOT OF 5) US $270.00
|
 Allen-Bradley Control Circuit Transformer 1497-B-M4-3-N US $49.95
|
 ALLEN BRADLEY CIRCUIT TRANSFORMER SN .750-KVA 1497-N34 US $257.00
|
 Allen Bradley Circuit Breaker 4A G040 US $39.99
|
 Allen Bradley Circuit Breaker 7A US $39.99
|
 1--Allen Bradley Circuit Breaker 1492-CB1G020 Ser.A US $22.93
|
 Allen-Bradley - Single Pole Circuit Breaker 0.5VAC 250VAC max 1492-G005 US $9.98
|
 ALLEN BRADLEY G-100 CIRCUIT BREAKER 1492-CB1, SERIES B, 10 AMPS US $25.00
|
 ALLEN BRADLEY 1492-GH050 MINIATURE CIRCUIT BREAKER, 5 Amp, Series B NIB US $25.56
|
 ALLEN BRADLEY 1492-CB1G300 CIRCUIT BREAKER, 30 Amp, SERIES B, NIB US $28.56
|
 ALLEN BRADLEY 1492-CB1G030 CIRCUIT BREAKER, 3 Amp, SERIES B, NIB US $28.56
|
 ALLEN BRADLEY CIRCUIT BREAKER 1492-CB3 1492CB3 32A 480V G320 SER A US $50.00
|
 ALLEN-BRADLEY 1492-GH050 Mini Circuit Breaker ! WOW ! US $21.99
|
 NEW Allen Bradley 5 Amp Circuit Breaker 1489-A2C050 Ser A US $50.00
|
 Allen Bradley Circuit Breaker 1492-CB3H030 3A 3P (4582) US $69.99
|
 NEW! ALLEN-BRADLEY 2A CIRCUIT BREAKER 1492-CB1F020 US $17.95
|
 ALLEN BRADLEY 140U-H6C3-C20-MT CIRCUIT BREAKER NEW* US $684.00
|
 2 Allen Bradley 1492-CB Circuit Breakers 5 Amp 1 Pole US $15.00
|
Allen Bradley Circuit
How to Troubleshoot PLC Hardware and PLC IO
The programmable logic controller, more commonly known as the PLC, plays a role in almost every automated manufacturing process. The PLC is an electronically programmable device capable of almost infinite combinations of relays, contacts, and timing circuits used to control industrial machinery of all types and sizes. It is essentially a computer designed to withstand a harsh manufacturing environment. It was designed to replace complex system of relays, cam switches, and other electromechanical circuits. The first PLC's were introduced in the late 1970's and they continued to grow in popularity since the day of their release.
PLC's are produced today by numerous major manufacturers including Siemens, Allen Bradley, Koyo, Fuji, Telemecanique, and Mitsubishi as well as a host of others. The programming of the PLC is performed through proprietary software produced by the specific manufacturer. Software among PLC's is not compatible and the logic programming, although it is very similar, has many subtle differences across the different brands. The program stored in the PLC is called the ladder logic program. Problems in the ladder program can become quite involved and that is an entirely different subject altogether. Hardware problems however, are fairly similar and can be easy to diagnose if you know a little about the particular model and it's input and output configuration.
Hardware failure of the brain, or main processor, is rare. It can be easily diagnosed visually most often by an illuminated fault indicator on the face of the PLC. An internal power supply failure would be a possibility if the PLC screen or power indicator were not lit and the technician verified that the correct voltage is applied to the power terminals. Some PLC's are equipped with an internal fuse which can also fail. These problems are not quite as common as a failure of an input or output terminal. The IO modules are more likely to fail due to loading problems.
Inputs and outputs are available in multiple configurations and voltages. Both AC and DC are available separately and sometimes in the same unit. These input/outputs can be both digital and analog and can be configured as a transistor output or as a dry relay contact. On both the input and output side it is critical to determine the specifications of the PLC first. Having the appropriate PLC software available at the time of troubleshooting is also necessary. The first recommendation would be to compare the illuminated inputs and outputs against the software in real time. An illuminated input not displaying properly as an energized input in the software is an indication of a failed or open input terminal. On the output side, an illuminated terminal not conducting the proper output voltage can mean one of two things, the output has failed in an open position, or an improper voltage is being applied to the common output terminal. The only way to verify this would be through the use of a multimeter set on the proper voltage scale. Overall, PLC hardware troubleshooting is not complex, yet it needs to be approached in an orderly fashion because both hardware and software are required to work in harmony for a PLC to perform its intended tasks.
About the Author
Chet is a longtime associate of Obsolete Industrial Parts, an informational site dedicated to locating obsolete industrial parts including plc hardware and io modules as well as other used obsolete parts. Their official website obsoleteindustrial.com is owned and operated by Val Marketing of Carbondale, PA.
If you are looking for a different item here are a list of related products on Electrical Engineering Equipment Company, please check out the following:
