# Interview questions based on Allen Bradley PLC

**URL:** <https://forumautomation.com/t/interview-questions-based-on-allen-bradley-plc/2585>\
**Category:** Interview Q & A\
**Tags:** plc\
**Created:** [November 5, 2017, 6:00pm UTC](https://forumautomation.com/t/interview-questions-based-on-allen-bradley-plc/2585 "2017-11-05T18:00:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [November 5, 2017, 6:00pm UTC](https://forumautomation.com/t/interview-questions-based-on-allen-bradley-plc/2585/1 "2017-11-05T18:00:45Z")

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**What are the software used with AB?**

- Pico soft for Pico PLC programming

- RS Logic 500 for Micrologix and SLC PLC programming

- RS Logic 5000 for control logix

**How are communication protocols distinguished?**

Communication protocols are distinguished with the number nodes supported, the speed of communication and total network.

**What are the various communication interface supported by AB?**

DH+, DH485, ETH, Modbus, Device Net and Control net

**Explain each of the above?**

_DH485:_ The DH‑485 industrial local area network is designed for factory-floor applications and uses the RS‑485 transmission standard

_Device net:_ A communication link that connects industrial devices to the network.

_Modbus:_ Modbus is the communication protocol used for transmitting information over a serial line between electronic devices.

_Controlnet:_ Is an open industrial network meets the demand of real-time, high-throughput applications.

_Data Highway:_ Data network used to connect a PLC network with another PLC network.

**What is RS logic?**

RS logic is in the family of IEC-1131 ladder logic programming package used to maximize the performance, save project development time, and to increase the productivity.