mbuis
Member
Here is the setup:
We have a MicroLogix 1100 (1763-L16AWA). It has a voltage range of plus/minus 10 Volts. It has a range of -31206 to 31206. It is recieving information from a load cell which has a max force of 50,000 pounds. The load cell sends a signal of plus/minus 5 Volts. Although we are only using the positive side. The program (rss?) was written quite a while ago. My experience with PLC's is very limited and happened years ago. I was tasked yesterday with improving the setup.
The system has opererated pretty much okay. However, in order to change the maximum load and minimum load being applied during the test you had to enter some number between 0 and 31206. What we would like to do is enter (for instance) a 1000 lbs for the min and 15,000 lbs for the max. In other words, enter the ACTUAL loads we want during the test. The rss has a SCP on one of the rungs. It was set up like this:
Input I:1.0
3453<
Input Min. 0
0<
Input Max. 31206
31206<
Scaled Min. 0
0<
Scaled Max. 31206
31206<
Output N7:0
3453<
It seems to me it should be setup like this:
Input I:1.0
3453<
Input Min. 0
0<
Input Max. 31206
31206<
Scaled Min. 0
0<
Scaled Max. 50000
50000<
Output N7:0
3453<
However, I recieve an error of "Operand sizes do not match."
Some one said it is because 50000>31206. Is that true? I could buy that.
My other question is should the input max actually be 15603 or HALF of 31206? Since the load cell is only going to give a max of 5 volts and the MicroLogix has a max of 10 volts?
We have a MicroLogix 1100 (1763-L16AWA). It has a voltage range of plus/minus 10 Volts. It has a range of -31206 to 31206. It is recieving information from a load cell which has a max force of 50,000 pounds. The load cell sends a signal of plus/minus 5 Volts. Although we are only using the positive side. The program (rss?) was written quite a while ago. My experience with PLC's is very limited and happened years ago. I was tasked yesterday with improving the setup.
The system has opererated pretty much okay. However, in order to change the maximum load and minimum load being applied during the test you had to enter some number between 0 and 31206. What we would like to do is enter (for instance) a 1000 lbs for the min and 15,000 lbs for the max. In other words, enter the ACTUAL loads we want during the test. The rss has a SCP on one of the rungs. It was set up like this:
Input I:1.0
3453<
Input Min. 0
0<
Input Max. 31206
31206<
Scaled Min. 0
0<
Scaled Max. 31206
31206<
Output N7:0
3453<
It seems to me it should be setup like this:
Input I:1.0
3453<
Input Min. 0
0<
Input Max. 31206
31206<
Scaled Min. 0
0<
Scaled Max. 50000
50000<
Output N7:0
3453<
However, I recieve an error of "Operand sizes do not match."
Some one said it is because 50000>31206. Is that true? I could buy that.
My other question is should the input max actually be 15603 or HALF of 31206? Since the load cell is only going to give a max of 5 volts and the MicroLogix has a max of 10 volts?