I am gonna program a PLC Siemens LOGO! The concept that I am gonna implement is to run 4 pumps.

1) The Pump 1 should run between 3 bar to 4 bar.

2) But when the pressure drops to 2 bar, the pump 2 and pump 3 should start and then cutoff at 5 bar. 

3) Then again if pressure reaches up to 2 bar, then this time pump 3 and pump 4 should run and then cutoff at 5 bar.

4) If again pressure reaches at 2 bar, pump 4 and pump 2 should run and cutoff at 5 bar.

same cyclic process should be like this every time between 2 and 5 bar for Pump 2, 3 & 4 and pump 1 always runs between 3 and 4 bar. If Pump 2 or Pump 3 or Pump 4 any one will be tripped then remaining 2 should always run between 2 to 5 bar. For Example pump 2 is tripped then 3 and 4 should run every time until the rectification of pump 2.

Can you please help me to make this logic? I am gonna use analog pressure transmitter 4 - 20 mA. Please help me I will be very thankful to you for this act of kindness. Thanks.

Dear Sir first of all I am really thankful to you for doing this much for me. Sir my final selected plc is

6ED1-052-1MD00-0BA6

and AM2 Module where sensor is connected is,

6ED1-055-1MA00-OBA0

and my final selected sensor is,

Honeywell

0 - 10 Bar

4 - 20mA ( 2 wire)

DC - 10-32V

P7620A1012

304SS/Ceramics/Vition

Sir please can you modify this file according to the above information. I shall be very thankful to you.