Spectrum Controls 1771sc-IFE32 - Manual (Page 37)

Chapter 5: Module Status and Input Data 27
Chapter 5
Module Status and Input Data
Chapter Objectives: Chapter Objectives: Chapter Objectives: Chapter Objectives: Chapter Objectives:
In this chapter, we describe:
· reading data from your module
· block transfer read block format
Reading Data fr Reading Data fr Reading Data fr Reading Data fr Reading Data from om om om om Y Y Y Y Your Module our Module our Module our Module our Module
Block transfer read programming moves status and data from the input module to the
processor’s data table in one I/O scan (Figure 5.1). The processor’s user program
initiates the request to transfer data from the input module to the processor.
Module input data is passed from the 1771sc-IFE32 to the PLC via a Block Transfer
Read. Two BTR formats are supported.
Bloc Bloc Bloc Bloc Block k k k k T T T T Transf ransf ransf ransf ransfer Read (BTR) Maps er Read (BTR) Maps er Read (BTR) Maps er Read (BTR) Maps er Read (BTR) Maps
Purpose:
41 Module data only
64 Module data and configuration
During normal operation, the processor transfers 41 words to the module when you
program a BTR instruction to the module’s address. When user scaling and configu-
ration echo are desired 64 words are transfered.
The block memory maps are shown below:
Module Data BTR Module Data BTR Module Data BTR Module Data BTR Module Data BTR
Word/Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0 Diagnostic Data Byte CE HF EE CS RT IS OR PU Diagnostics
1 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Channel Fault
2 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Channel Fault
3 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Under Range
4 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Under Range
5 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Over Range
5 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Over Range
7 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Sign
8 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Sign
9 Channel 1 Data Data
10 Channel 2 Data Data
. . .
40 Channel 32 Data Data
In differential mode every other channel is skipped. For example: Word 9 = Channel 1,
Word 11 = Channel 2, Word 13 = Channel 3...