Rockwell Automation 1790D-NOV2/TNOV2 CompactBlock LDX Analog Modules - Manual (Page 59)

Publication 1790-UM001A-EN-P - March 2002
Module Diagnostics and Troubleshooting 5-5
Analog Input Module Error
Definition Table Analog input module errors are expressed on a channel bases in input
read word 4. The structure of the status data is shown below.
Word/Bit Descriptions
Module Errors Table 5.4 lists possible errors that cause the analog input module
status bits to be set.
Table 5.3
Word Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
4 Not used S3 S2 S1 S0
Word Decimal Bit Description
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
Table 5.4
Status Bit Table 1790D-N4CO/-TN4CO, 1790D-N4VO/-TN4VO
Range
Setting Underrange In Range Overrange Open
Circuit Short
Circuit No Field
Power
4-20mA <4mA
Set Not set >20mA
Not set Set Set Set
0-20mA <0mA
Not set Not set >20mA
Not set Not set Not set Set
0-10V dc <0V dc
Not set Not set >10V
Not set Not set Not set Set