Manual

Publication 1756-UM009C-EN-P - December 2010 165
Non-isolated Analog Output Modules (1756-OF4 and 1756-OF8) Chapter 7
Channel Status Word Bits – Integer Mode
The Channel Status word has these differences when used in integer mode.
• Only the Output in Hold and Open Wire conditions are reported by the
module.
• Calibration Fault reporting is not available in this word, although the
Calibration Fault bit in the Module Fault word will still activate when
that condition exists on any channel.
• There is only one Channel Status word for all four channels on
1756-OF4 and all eight channels on 1756-OF8.
The table lists the conditions that set each of the Status Word bits.
Tag (Status
word)
Bit Event that sets this tag
ChxOpenWire Odd-numbered bits from bit
15 …bit 1 (that is, bit 15
represents channel 0).
For a full listing of the
channels these bits
represent, see
page 163 .
The Open Wire bit is set only if the configured Output Range is 0 …20 mA,
and the circuit becomes open due to a wire falling or being cut when the
output being driven is above 0.1mA. The bit will remain set until correct
wiring is restored.
ChxInHold Even-numbered bits from
bit 14…bit 0 (that is, bit 14
represents channel 0).
For a full listing of the
channels these bits
represent, see
page 163 .
The Output In Hold bit is set when the output channel is currently holding. The
bit resets when the requested Run mode output value is within 0.1% of
full-scale of the current echo value.