Rockwell Automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE - Manual (Page 18)

2–2 Troubleshooting Your Input Module
Publication 1771Ć6.5.116 - July 1996
An invalid scaling data bit (bit 02) is set if invalid scaling data is
entered into any of the minimum/maximum scaling value words.
Note that minimum equal to maximum is an invalid value. If
invalid values are entered into the minimum or maximum scaling
words the corresponding read block transfer input channel word will
be set to 0000.
Bit 02 is set if an invalid digital filter value is entered (e.g., 1F). If an
invalid digital filter value is entered, the module will not perform
digital filtering.
The real time sample (RTS) fault bit (bit 03) is set if the module is
configured for RTS and a block transfer read has not occurred within
the user-programmed period.
Bit 04 is the calibration status bit. This bit is reset (0) when a
successful calibration is completed. If the bit is set (1), an incorrect
voltage/current was applied, or offset and gain calibrations were
attempted together.
The EEPROM status bit (05) is set when an error occurs when
saving calibration data to nonvolatile memory. If this bit is set at
powerup, the EEPROM data did not pass checksum and calibration
values are being used.
The hardware failure bit (06) is set when a blown fuse is detected,
or when the EEPROM can’t recover from a fault.
Word 2
Word 2 provides for under-range conditions. When a particular
channel input is under-range, the associated bit will be set. As long
as inputs are under range the associated bit remains set. Bit 00
corresponds to channel 1, bit 01 to channel 2, etc.
Word 3
Word 3 provides for over-range conditions. When a particular
channel input is over-range, the associated bit will be set. As long as
inputs are in range the associated bit remains reset. Bit 00
corresponds to channel 1, bit 01 to channel 2, etc.
Word 4
Word 4 provides an indication of a particular channel’s input polarity
(set, or 1 = negative; reset, or 0 = positive). Bit 00 corresponds to
channel 1, bit 01 to channel 2, etc.