PLC and Relay

PLC and Relay

The relay module isn't to be used as a technique of extending the utmost range of alarms allowable in multiple station operations. PLC and Relay Modules are an important part of the industrial systems.

INSTALLATION INSTRUCTIONS:

This relay module ought to be put in a very junction box. All connections ought to be created by a professional skilled worker in accordance with the wants of the National Electrical Code and/or any native codes having jurisdiction.

1. Close up the most one hundred twenty VAC power electrical fuse.

2. Install smoke alarm; heat alarm as per directions provided in instruction manuals.

3. Connect the black wire of the relay module to the black wire of the one hundred twenty VAC.

4. Connect the yellow wire of the relay module to the yellow wire of the warning device or heat alarm.

5. Give the connection from the white wire of the relay module to the white wire of the one hundred twenty VAC.

6. Connect the auxiliary device to the relay module contact leads as needed. Both usually open and usually closed contacts are obtained to regulate the auxiliary device.

NOTE: The relay contact rating is 5 Amps most at one hundred twenty VAC or twenty-eight VDC.

7. Any unused leads should be insulated with a wire nut. 
8. Insert the relay module into the junction box and install the protection.

9. Apply one hundred twenty VAC power to the circuit and check the alarms and therefore the auxiliary device for correct operation.

Programmable Logic Controller

• The very first programmable logic controllers were introduced in the late 1960s.
• Programmable logic controllers (PLC) are actually developed to offer the same functionality of the existing relay logic systems.
• Programmable, reusable and reliable

1. Could withstand a harsh industrial environment.
2. PLC had no hard drive, they had battery back-up.
3. It could start in seconds.
4. Used ladder logic for programming.