Instruction Manual

Publication 1790-IN010B-EN-P - April 2003

I/O Memory Mapping

1790P-TN4C0 Analog Input Module Input Data File

Word/Bit Descriptions for 1790P-TN4C0 Analog Input Module

1790P-TN0C2 Analog Output Module Output Data File

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

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

Word Bit Position

1514131211109876543210

0 Not Used Analog Output Data Channel 0

1 Not Used Analog Output Data Channel 1