Good morning everybody, I hope you are very well.
I share with you the information of the PLC LOGO! Siemens and expansions that we have installed.
It is a Logo! PLC model 230 RCE 6ED1052-1FB08-0BA1, to which we have installed two expansions (from left to right):
1) The first expansion: DM16 230 R
6ED1055-1FB10-0BA2 (Siemens)
2) The second and last expansion: AM2
6ED1055-1MA00-0BA2 (this expansion we have it with its independent source at 24 Volts) (Siemens).
Then:
We have a pressure transducer of the brand Pnomek, which sends an analog signal from 4 to 20 mA, we have it correctly connected to the expansion AM2 because in the display (the little screen of PLC Logo!) we can appreciate the pressure values when changes occur in the discharge line of the pipes; that is, the pressure transducer is installed is at the outlet of the pumps.
What happens, is that we want to configure/program the PLC, yes it is already a programming issue, to perform the following.
Normal operation:
We call normal operation that which will happen at least 90% of the time, I explain it below:
1. The range of the transducer is from 0 to 101 PSI, having this in mind in the building must be maintained a minimum pressure of 50 PSI and a maximum of 100 PSI, then
2. When water consumptions occur in the piping system, the pressure should decrease, let's assume the pressure is at 60 PSI (as an example), then they start washing, cooking, etc., and the pressure then drops to 50 PSI, the transducer sends that signal to the PLC and starts the pump.
2.1. At this point I comment again that there are two pumps, both are identical, 10 HP.
3. Then when the pressure drops to 50 PSI, pump #1 should be started, when it turns on and after some time (it varies and is not constant) it reaches 100 psi, at that moment the PLC should order pump #1 to turn off.
4. Then the pressure will decrease from 100 PSI to 50 PSI, again product of the consumptions (understand that we do not want to keep the pressure constant).
5. When the pressure drops again from 50 PSI, then the transducer sends again the signal for the PLC to activate pump #2, not pump #1.
5.1. It is at this point that we have not been able to program the PLC, so that from the same input (in this case the pressure transducer) it alternates the pumps each time the cycle of start (at 50 PSI) off (at 100 PSI) is fulfilled.
6. Because the objective is that, always alternate the pumps, between pump #1 and pump #2.
Thanks in advance.
I share with you the information of the PLC LOGO! Siemens and expansions that we have installed.
It is a Logo! PLC model 230 RCE 6ED1052-1FB08-0BA1, to which we have installed two expansions (from left to right):
1) The first expansion: DM16 230 R
6ED1055-1FB10-0BA2 (Siemens)
2) The second and last expansion: AM2
6ED1055-1MA00-0BA2 (this expansion we have it with its independent source at 24 Volts) (Siemens).
Then:
We have a pressure transducer of the brand Pnomek, which sends an analog signal from 4 to 20 mA, we have it correctly connected to the expansion AM2 because in the display (the little screen of PLC Logo!) we can appreciate the pressure values when changes occur in the discharge line of the pipes; that is, the pressure transducer is installed is at the outlet of the pumps.
What happens, is that we want to configure/program the PLC, yes it is already a programming issue, to perform the following.
Normal operation:
We call normal operation that which will happen at least 90% of the time, I explain it below:
1. The range of the transducer is from 0 to 101 PSI, having this in mind in the building must be maintained a minimum pressure of 50 PSI and a maximum of 100 PSI, then
2. When water consumptions occur in the piping system, the pressure should decrease, let's assume the pressure is at 60 PSI (as an example), then they start washing, cooking, etc., and the pressure then drops to 50 PSI, the transducer sends that signal to the PLC and starts the pump.
2.1. At this point I comment again that there are two pumps, both are identical, 10 HP.
3. Then when the pressure drops to 50 PSI, pump #1 should be started, when it turns on and after some time (it varies and is not constant) it reaches 100 psi, at that moment the PLC should order pump #1 to turn off.
4. Then the pressure will decrease from 100 PSI to 50 PSI, again product of the consumptions (understand that we do not want to keep the pressure constant).
5. When the pressure drops again from 50 PSI, then the transducer sends again the signal for the PLC to activate pump #2, not pump #1.
5.1. It is at this point that we have not been able to program the PLC, so that from the same input (in this case the pressure transducer) it alternates the pumps each time the cycle of start (at 50 PSI) off (at 100 PSI) is fulfilled.
6. Because the objective is that, always alternate the pumps, between pump #1 and pump #2.
Thanks in advance.