Greetings from all the way down here in New Zealand
I have a challenge for you all.....
I have a need for a PLC to run a Doser pump to pump Additive into a Diesel tank.
The tricky bit is that the Main tank/cylinder is horizontal, so the maths isnt nice and straightforward like if it was a vertical tank.
The other tricky part is that tank filling happens at random times by a third party, and is a random quantity. Unfortunately there is no key lock, or hatch cover, or button press or any other easy digital triggers to alert the PLC that the tank is being filled.
We have an Analog pressure/level sensor which needs to understand/realise when the tank is topped up with diesel and that will trigger the Doser Pump routine.
We need to send alerts/updates via SMS/Txt.
So, I was looking at the Siemens Logo with CMR2020 cellular modem.
The modem integrates nicely with the Logo and it will let me send and receive txts/status etc.
Unfortunately I dont think the Logo will be able to do the complicated maths though.
PlanB is to use a calibration Table for the tank contents (more accurate), however the Logo cant handle tables, so was thinking of Move/Compare type blocks, but again I think the Logo would be limited by its available Block memory?
PlanC is to look at a S7-1200 which can do the complicated maths (Calculate). It doesnt do Tables though, so was thinking of Move/Compare type blocks as the S7-1200 has the block memory capacity?
It looks like the CP1242-7 modem works with it and will do what I require.
PlanD(!) - Looked at Eaton Easy4 - as it does Tables, but doesnt do complicated maths. The Easy4s cant receive SMS/txts, only MODBUS TCP.
There are a few other requirements ie. need 2 Analog inputs, 1 High speed digital input (200Hz) for Flowmeter, 2 Digital inputs for buttons, and 1 Digital out for Doser pump.
So, Long story short, I am looking for Hardware suggestions/recommendations please.
Many thanks.
Cheers,
Steve
I have a challenge for you all.....
I have a need for a PLC to run a Doser pump to pump Additive into a Diesel tank.
The tricky bit is that the Main tank/cylinder is horizontal, so the maths isnt nice and straightforward like if it was a vertical tank.
The other tricky part is that tank filling happens at random times by a third party, and is a random quantity. Unfortunately there is no key lock, or hatch cover, or button press or any other easy digital triggers to alert the PLC that the tank is being filled.
We have an Analog pressure/level sensor which needs to understand/realise when the tank is topped up with diesel and that will trigger the Doser Pump routine.
We need to send alerts/updates via SMS/Txt.
So, I was looking at the Siemens Logo with CMR2020 cellular modem.
The modem integrates nicely with the Logo and it will let me send and receive txts/status etc.
Unfortunately I dont think the Logo will be able to do the complicated maths though.
PlanB is to use a calibration Table for the tank contents (more accurate), however the Logo cant handle tables, so was thinking of Move/Compare type blocks, but again I think the Logo would be limited by its available Block memory?
PlanC is to look at a S7-1200 which can do the complicated maths (Calculate). It doesnt do Tables though, so was thinking of Move/Compare type blocks as the S7-1200 has the block memory capacity?
It looks like the CP1242-7 modem works with it and will do what I require.
PlanD(!) - Looked at Eaton Easy4 - as it does Tables, but doesnt do complicated maths. The Easy4s cant receive SMS/txts, only MODBUS TCP.
There are a few other requirements ie. need 2 Analog inputs, 1 High speed digital input (200Hz) for Flowmeter, 2 Digital inputs for buttons, and 1 Digital out for Doser pump.
So, Long story short, I am looking for Hardware suggestions/recommendations please.
Many thanks.
Cheers,
Steve