Unpacking Bits from a 16bit Register in a FieldServer Configuration

Introduction

What happens if you want to serve some/all of the bits that form a 16 bit register. ie. Your client reads a 16bit register but you want to serve those bits as separate binary objects.

Here is an example

• A series of 16 bit numbers
• A series of bits

It depends on what kind of operation access the Data Array. If it’s a 16 bit or analog number type operation then it addesses 16 bit numbers. If the operation is a bit operation like for a binary data point then the operation addresses each bit.

Therefore DA_PACKED[0] is ambiguous.

If you connected a server Map Descriptor to that point and the type is an Analog In/output then it means the 16bit number found at DA_PACKED[0].

If you connected a server Map Descriptor to that point and the type is an Binary In/output then it means the bit number found at DA_PACKED[0] and DA_PACKED[15] is the 16^th bit. DA_PACKED[16] is the 1^st bit of the next 16 bit number…

If that seems to complicated then add one more move:

Data_Arrays

This move moves the 16 bits for DA_PACKED[0] to 16 separate bits with unambiguous offsets and you can use those in the server map descriptors.

Heads Up

Preloads

Moves