Help to Convert String (Hex Format) to Decimal

[lotuseater 0]

We are doing some testing communicating serially with a linear actuator in order to get its current position using an Allen Bradley Compact Logix processor. The information comes back as a string and I am able to extract the part of the string I need using an MID instruction. This string contains a hexadecimal value. The actuator company has demonstrated to me how find the actual position using this value within Microsoft Excel, but I would like some assistance automating this in my PLC. Here is an example of how to find the position using Excel: String Value from device: 'FFFFEC14' Excel HEX2DEC() = 4294962196 Constant Base Position: 'FFFFFFFF' Excel HEX2DEC() = 4294967295 Actual Position = 4294962196 - 4294967295 - 1 = -5100 Actual Position is -51.00 mm This matches up to the actual value when looking at the front end software for the device, but I would like to complete this procedure within my PLC. Does anyone have any tips for converting the string value (HEX) to an appropriate decimal value? Thanks. Edited 2 Nov 2008 by lotuseater

[pandersen 0]

There seems to be more discussion going on here: http://www.plctalk.net/qanda/showthread.php?p=295793