Rockwell Automation 1734-IA2, User Manual

Page: 117 / 242

Publication 1734-UM001D-EN-P - April 2008
POINT I/O Module Data 115
Channel Status
The module status bits included in each Channel Status Byte are the following:
•
Channel Fault
•
CAL Mode
•
Low Clamp
•
High Clamp
Channel Status can be read individually using RSNetWorx software or by
reading the Channel Status Byte in the Module Produce Assembly.
•
Channel Fault Bit -This general channel health bit (Channel Status Bit 0)
indicates that the module is operating with or without faults. If any
alarms or faults are detected, this bit is set.
•
Calibration Status Bit - This status bit (Channel Status Bit 1) is set when
the channel is in Calibration mode. At Begin Calibration, the module is
put into Calibration mode. This bit does not get set until the Output
Low Reference or Output High Reference commands are sent.
Do not
confuse this bit with the Bad Calibration Status bit, which is set if the
module is
not calibrated.
•
Low Clamp Status Bit - This status bit (Channel Status Bit 2) is set when
the output data is clamped to it’s minimum level. The default value is
-32,768 counts. Low Clamp Status can be read on a per-channel basis or
by reading the Module Produce Assembly.
•
High Clamp Status Bit - This status bit (Channel Status Bit 3) is set
when the output data is clamped to its maximum level. The default value
is 32,767 counts. High Clamp Status can be read on a per channel basis
or by reading the Module Produce Assembly.
Open-wire Detection (1734-OE2C only)
This condition has no unique status bit, but if an open-wire condition exists,
the general Channel Status bit is set. The module can’t determine what the
condition is: open wire or loss of field power. The Channel indicators blinks
red.
Power Fail Detection (1734-OE2V only)
This condition has no unique status bit, but if a power failure condition exists,
the general Channel Status bit is set. The Channel indicators goes to solid red.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Not used High
Clamp Low
Clamp CAL
Mode Channel
Fault