|
|
|
|
#51
11/23/2006, 11:21 AM
|
|||
|
|||
|
Nooo you can't give up! Look what I'm playing with today:
 Couldn't find float switches anywhere so I'm using this... a vibrating level sensor from Endress & Hauser. I'm using a Modicon Micro PLC that has 24 I/O and 10-12 analog I/O.  Have built a HMI using Labview but might go to using some kind of SCADA software instead. All good fun! Just looking for a nice sealed enclosure for the PLC, relays and I/O strips... something that has a window in it. Anyways, will keep you guys updated. |
|
#53
12/20/2006, 03:44 AM
|
|||
|
|||
|
Ok, a new job description and no graphics/ads to produce, so I have time and resources to resume this project. I need to update the program though, I have two 18" linear actuators to raise my canopy, as well as my lighting rig
 I want to change the height the lights are thru out the day. I also want to ad the Canopy door actuator to the "too hot" alarm (to raise the doors).Even though I have the tank for this, I'm getting a new one made from a better company. THe owner is giving me a screaming deal. Guess I'll have two 5'x4'x16" eurobraced acrylic tanks Maybe one will turn into the new Reef Nutrition test tank at work
__________________
Gresham _______________________________ Feeding your reef...one polyp at a time |
|
#58
02/01/2007, 06:18 AM
|
|||
|
|||
|
Starting mine this week with a GE 90 Micro PLC.
How the Panel communicate with your PLC?
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#59
02/01/2007, 05:28 PM
|
|||
|
|||
|
standard db9 cable. Only need 4 wires though Tx, Rx, Gnd, and power.
Here is the symbol table. (Mods this is not any propritery s/w it's just the I/O assignments). To help others with address assignments for PLCs. 
__________________
"Technology is dominated by two types of people: those who understand what they do not manage, and those who manage what they do not understand." |
|
#61
02/01/2007, 05:32 PM
|
|||
|
|||
|
Its an eye test.
 Seriously, if you ned it I'll post as a PDF. Gresh, how are you doing my RC friend.Chaz
__________________
"Technology is dominated by two types of people: those who understand what they do not manage, and those who manage what they do not understand." |
|
#62
02/01/2007, 05:33 PM
|
|||
|
|||
|
Nice.
I have setup a 5$ 0.2*C accuracy probe (lm35 chip) which give 10mV/*C Problem is my PLC is 0-10V with 10mV accuraccy. Any way to have my probe output multiplied by 10? That would give me 0.1*C resolution on my PLC.
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#63
02/01/2007, 06:15 PM
|
|||
|
|||
|
You need an instrumentation amp... (OP-AMP) circuit or a purpose built amp. eBay is the place to look for probe amps unless you want to DIY.
|
|
#64
02/01/2007, 06:42 PM
|
|||
|
|||
|
Yeah that's what I tought, I wanted it dead sample plug in, my probe have 3 wire. +5 - +30V, ground, output.
I'll make an opamp circuit
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#65
02/01/2007, 08:03 PM
|
|||
|
|||
|
With an LM324 op amp it's worst
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#66
02/01/2007, 08:19 PM
|
|||
|
|||
|
?
|
|
#67
02/01/2007, 10:02 PM
|
|||
|
|||
|
With a non-inverting gain of 10, I get 2.546 volts but the PLC's value fluctuate +-0.2V.
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#68
02/02/2007, 01:06 AM
|
|||
|
|||
|
http://www.allaboutcircuits.com/vol_...tml/conversion
I'll try a 4-20ma transmitter. basicly using a 25 ohms resistor to set a 0.1V (10*C) to 0.5V (50*C) converted to 4-20ma. I can set the range I want with the resistor
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#69
02/02/2007, 08:45 AM
|
|||
|
|||
|
Icefire,
Are you using Thermocouples or RTD, if RTD how many wires? Nice link thanks.
__________________
"Technology is dominated by two types of people: those who understand what they do not manage, and those who manage what they do not understand." |
|
#70
02/02/2007, 11:16 AM
|
|||
|
|||
|
Yeah the op-amp circuit needs to be fairly precisse due to the impedence problems. You can use an LM-324 but the supporting circuitry has to be a bit more complex. Burr-brown makes some very nice instrumentation amps that are much better suited to the application.
There is also a good app-note on the national site regarding PH amp design. I will see if I can dig it up. |
|
#71
02/02/2007, 12:04 PM
|
|||
|
|||
|
Quote:
 Serioulsy, I'm OK and still at Reed I need to talk to you about this, I'm ready to get this project finished and move on to another
__________________
Gresham _______________________________ Feeding your reef...one polyp at a time |
|
#72
02/02/2007, 12:06 PM
|
|||
|
|||
|
Bean I was using LM324.
__________________
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby 1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails Some softys PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025 |
|
#73
12/10/2007, 07:03 AM
|
|||
|
|||
|
Gesh,
for your actuators, or the motor driven or pneumatic? |
|
|
Linear Mode
