Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual - Manual (Page 64)

Publication 1794-6.5.12 - September 2011
52 Troubleshoot the Module
The FLEX I/O Thermocouple, RTD, and mV module returns diagnostics to
the processor in Word 9 of the block transfer read (BTR) file. These
diagnostics give you information on the status or condition of the module.
Chapter Summary This chapter specified the different status indicators that would help the user
troubleshoot the module.
Blinking
(when faults
are enabled,
and bit set)
Indicates a noncritical fault (such as open sensor). Input data set to
maximum, and indicator flashes at about 1 Hz rate.
Power Off Module not powered
Green On Module receiving power
Status Indicators
Indicator Color State Description
Diagnostic Bits in Word 9
Word Dec. Bits
(Octal Bits) Description
Read Word 9 00…03
Diagnostic bits
– represent module configuration
and/or hardware errors.
Bit 03
02 01 00
0 0 0 0 Reserved for factory use
0 0 1 0 Improper module
configuration
0 1 1 0 RAM f ault
0 1 1 1 EEPROM fault
0001, 0100, and 0011…1111 Reserved for
factory use
04 Series of Unit (SAB) – 0 = Series A, 1 = Series B
05…06 Cold junction compensation fault bits – These
bits are set (1) when the corresponding cold junction
compensator lead is broken, unattached or shorted,
and the thermocouple is set to "external
compensation.” Bit 05 corresponds to CJC1, and bit
06 to CJC2.
07 Not used
08…15
(10…17)
Fault alarm bits
– An alarm bit is set (1) when an
individual input lead opens (broken, disconnected). If
the alarm is enabled, the channel reads maximum
value. Bit 08 (10) corresponds to input channel 0, bit
09 (11) to channel 1, and so on.