User Manual

Publication 1790-UM001A-EN-P - March 2002
Module Data, Status, and Channel Configuration for Analog Input Modules 3-3
Analog Input Data File With Discrete Input Expansion Modules
The data table below shows the structure for an analog base module
with one (1) of the following 8-input modules:
• 1790-8BV8BX/-T8BV8BX
• 1790-T8A0X discrete expansion module.
1790D-N4C0/-TN4C0, 1790D-N4V0/-TN4V0 Input Data File with 8-Bit
Discrete Expansion Module
Word/Bit Descriptions
Word Bit Position
1514131211109876543210
0 Not Used Analog Input Data Channel 0
1 Not Used Analog Input Data Channel 1
2 Not Used Analog Input Data Channel 2
3 Not Used Analog Input Data Channel 3
4 Not Used S3 S2 S1 S0
5 Not Used D7 D6 D5 D4 D3 D2 D1 D0
Word Decimal Bit Description
Read Word 0 Bits 00-11 Channel 0 input data
Bits 12-15 Not used: Set to 0
Read Word 1 Bits 00-11 Channel 1 input data
Bits 12-15 Not used: Set to 0
Read Word 2 Bits 00-11 Channel 2 input data
Bits 12-15 Not used: Set to 0
Read Word 3 Bits 00-11 Channel 3 input data
Bits 12-15 Not used: Set to 0
Read Word 4 Bits 00-03 Status bits for individual channels - Bit 00 corresponds to input
channel 0, bit 01 corresponds to input channel 1 and so on.
When set (1) indicates:
• No field power
• Open wire (4-20mA current input only)
• Under range (4-20mA current input only)
• Recoverable module fault (whole channel to be set)
• Unrecoverable module fault (whole channel to be set)
Bits 04-15 Not used: Set to 0
Read Word 5 Bits 00-07 Discrete Input expansion data
Bits 08-15 Not Used