Guys,
I'm checking on some of the analog input at the SLC 5/04, I couldn't understand some input (min & max) & scaled input (min & max) settings.
1) For example, I tried to inject 4-20 mA into one of the analog channels (completely remove all the 2 cables at the channel), I managed to get the below reading at RSLogix 500:
Inject (mA) Value
4 3271
8 6545
12 9818
16 13094
20 16368
But at the SCP instruction
Input = I:6.3 (3150)
Input Min. = N7:56 (3175)
Input Max. = N7:57 (9007)
Scaled Min. = N7:66 (0)
Scaled Max = N7:67 (5000)
Output = N7:174 (-21)
a) I taught the Input Min shall follow the inject value of 4 mA, which is 3271?
b) The Input Max. value shall follow the inject value of 20 mA, which is 16368?
The field device is a 4 - 20 mA pressure transducer.
2) while for another analog input module;
Inject (mA) Value
4 3274
8 6551
12 9827
16 13106
20 16383
But at the SCP instruction
Input = I:7.1 (0)
Input Min. = N7:58 (1507)
Input Max. = N7:59 (0)
Scaled Min. = N7:68 (0)
Scaled Max = N7:69 (5500)
Output = N7:160 (5500)
c) The Input Min. is larger than Input Max.?
The field device is a pressure transducer using 4 - 20 mA.
Both analog input module is 1746-NI4.
I'm checking on some of the analog input at the SLC 5/04, I couldn't understand some input (min & max) & scaled input (min & max) settings.
1) For example, I tried to inject 4-20 mA into one of the analog channels (completely remove all the 2 cables at the channel), I managed to get the below reading at RSLogix 500:
Inject (mA) Value
4 3271
8 6545
12 9818
16 13094
20 16368
But at the SCP instruction
Input = I:6.3 (3150)
Input Min. = N7:56 (3175)
Input Max. = N7:57 (9007)
Scaled Min. = N7:66 (0)
Scaled Max = N7:67 (5000)
Output = N7:174 (-21)
a) I taught the Input Min shall follow the inject value of 4 mA, which is 3271?
b) The Input Max. value shall follow the inject value of 20 mA, which is 16368?
The field device is a 4 - 20 mA pressure transducer.
2) while for another analog input module;
Inject (mA) Value
4 3274
8 6551
12 9827
16 13106
20 16383
But at the SCP instruction
Input = I:7.1 (0)
Input Min. = N7:58 (1507)
Input Max. = N7:59 (0)
Scaled Min. = N7:68 (0)
Scaled Max = N7:69 (5500)
Output = N7:160 (5500)
c) The Input Min. is larger than Input Max.?
The field device is a pressure transducer using 4 - 20 mA.
Both analog input module is 1746-NI4.