Table of Contents
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Chapter 5
Module Diagnostics and Troubleshooting
Module Errors
Channel Status Indicator
Operation
44
Table 35 - Word/Bit Descriptions
Word
Decimal Bit
Bits 00...03
Read Word 4
Bits 04...15
Table 36
lists possible errors that cause the analog input module status bits to
be set.
Table 36 - Status Bit Table 1790D-N4CO/-TN4CO, 1790D-TN4VO
Range Setting
Underrange
<4 mA
4...20 mA
Set
<0 mA
0...20 mA
Not set
<0V DC
0...10V DC
Not set
Table
37and
Table 38
show individual channel status indicator operation.
Table 37 - Analog Input Modules — 1790D-TN4C0
Status
Description
Flashing green/red
Power up
Off
Offline
Red
Online and no field power
Red
DeviceNet connection and no field power
(1)
Flashing red
Field power and open wire — 4...20 mA range only
Green
Field power and valid input
Green
Input over range
Input under range
Flashing red
1
<3 mA — 4...20 mA range only
Flashing red
Recoverable fault
(1) Green for 0...20 mA range.
(2) Can be determined from the data table.
Table 38 - Analog Output Modules — 1790D-TN0V2, 1790D-TN0C2
Status
Description
Flashing green/red
Power up
Off
Off line
Off
On line and no field power
Green
DeviceNet connection and no field power
Green
Field power and open wire
Green
Field power and valid output
Flashing red
Field power and output out of range
Flashing green
Output idle
Flashing red
Recoverable fault
Rockwell Automation Publication 1790-UM001B-EN-P - April 2021
Description
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...20 mA current input only
• Under range — 4...20 mA current input only
• Recoverable module fault (whole channel to be set)
• Unrecoverable module fault (whole channel to be set)
Not used: Set to 0
In Range
Overrange
Open Circuit
>20 mA
Not set
Set
Not set
>20 mA
Not set
Not set
Not set
>10V
Not set
Not set
Not set
2
Short Circuit
No Field Power
Set
Set
Not set
Set
Not set
Set
(2)
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