Issue
Negative values presented to an IC3-SNP Integration Controller are displayed starting at 65535.
Environment
Sigma
Integration Controllers
IAC Controllers
Unifact Controllers
Cause
The IC3-SNP Integration Controller calculates the negative value incorrectly.
Resolution
To overcome this issue it will be necessary to create a new Lookup table and to allocate it to the IC3-SNP Analogue Input object.
1 - In Sigma "System Manager" select "System Setup" and create a new lookup table, using the configuration shown below.
2 - Edit the Analogue Input object to include the new Lookup Table number, select to download the object.
3 - In Sigma "System Diagnostics" download the Lookup Table to the IC3-SNP.
4 - The lookup table shown above assumes that the value being presented is in whole numbers, i.e. a received value of 1 equals 1, but there are instances when the value received may have a *10 factor applied. In this case the lookup table is modified as shown below.
Input Output
0 0
32767 3276.7
32768 -3276.8
65535 -0.1
