Spectrum Controls 1771sc-IFE32 - Manual (Page 27)

Chapter 4
Configuring Your Module
Chapter Objectives: Chapter Objectives: Chapter Objectives: Chapter Objectives: Chapter Objectives:
In this chapter, we describe;
· configuring your module’s features
· conditioning your inputs
· entering your data.
Configuring your Configuring your Configuring your Configuring your Configuring your
input module:
input module: input module: input module: input module:
Because of the many analog devices available and the wide variety of possible
configurations, you must configure your module to conform to the analog device and
specific application that you have chosen. Data is conditioned through a group of
data table words that are transferred to the module using a block transfer write
instruction.
The software configurable features available with the Analog Input Module (cat. no.
1771sc-IFE32 are:
·
input range selection
· input type
· data format
· digital filtering
· real time sampling
· scaling to engineering units
Bloc Bloc Bloc Bloc Block k k k k T T T T Transf ransf ransf ransf ransfer er er er er Write Write Write Write Write
(BTW) Maps (BTW) Maps (BTW) Maps (BTW) Maps (BTW) Maps
Two distinctly different block transfer writes (BTW) can be performed to configure
the module. The first, BTW1, configures the module.
During normal operation the processor transfers 0 to 22 words to the module when
you program a block transfer write instruction to the module’s address. This BTW file
contains configuration words for each channel.
When user-define scaling is used a second BTW word is required and it’s length is
64 words.
BTW: N Words: Purpose: Required?
BTW1 23 Module Configuration Required
BTW2 64 User Scaling Optional