Successfully reported this slideshow.

PLC Internal Relays

1

Share

Upcoming SlideShare
Plc timers
Plc timers
Loading in …3
×
1 of 4
1 of 4

PLC Internal Relays

1

Share

Download to read offline

plc, PLC Applications, Programmable Logic Controllers, Programmable, Logic, Controllers, PROGRAMMING,
gates, COUNTERS, Timers,LOGIC CIRCUITS, INTERNAL RELAYS, ARITHMETIC FUNCTIONS, Application, Data Types and Addressing,

plc, PLC Applications, Programmable Logic Controllers, Programmable, Logic, Controllers, PROGRAMMING,
gates, COUNTERS, Timers,LOGIC CIRCUITS, INTERNAL RELAYS, ARITHMETIC FUNCTIONS, Application, Data Types and Addressing,

More Related Content

Related Books

Free with a 14 day trial from Scribd

See all

Related Audiobooks

Free with a 14 day trial from Scribd

See all

PLC Internal Relays

  1. 1. 5. INTERNAL RELAYS Internal relays are built-in functions with PLC. They have other terms widely used: auxiliary relays, markers, bit storage and coils. Their addresses are ranging from M0.0 to M255.7 Internal Bit Storage (Markers) Internal relay Resetting Latch Motor start/stop using only ONE push button (Task3)
  2. 2. Latching using Set and Reset Coil, S-R and R-S Flip Flop (Task1) Set – Reset with Reset priority (Task4) Set – Reset with Set priority
  3. 3. Master Control Relay MCR functionality is activated by the MCRA rung. The rungs between the MCR< and the MCR> (outputs Q4.0, Q4.1) are executed as follows: - I0.0 = "1" ( MCR is ON ): Q4.0 is set to "1" if I0.3 is logic "1", or will remain unchanged if I0.3 is "0" and the logic state of I0.4 is assigned to Q4.1. - I0.0 = "0" ( MCR is OFF): Q4.0 remains unchanged regardless of the logic state of I0.3 and Q4.1 is "0" regardless of the logic state of I0.4. - In the next rung, the instruction ---(MCRD) deactivates the MCR. This means that you cannot program any more MCR zones using the instruction pair ---(MCR<) and ---(MCR>).
  4. 4. - -

×