Allen-Bradley SLC 500 1746-NR4, User Manual

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Chapter 5
Channel Configuration, Data, and Status
5–21
Explanations of the status conditions follow.
Important: The status bits reflect the settings that were made in the
configuration word. However, two conditions must be true if
the status reflected is to be accurate:
•
The channel must be enabled.
•
The channel must have processed any new configuration
data.
Input Type Status (Bits 0–3)
The input type bit field indicates what type of input device you have
configured for the channel. This field reflects the input type selected in bits
0–3 of the channel configuration word when the channel is enabled. If the
channel is disabled, these bits are cleared (0).
Data Format Status (Bits 4 and 5)
The data format bit field indicates the data format you have defined for the
channel. This field reflects the data type selected in bits 4 and 5 of the
channel configuration word when the channel is enabled. If the channel is
disabled, these bits are cleared (0).
Broken Input Status (Bits 6 and 7)
The broken input bit field indicates how you have defined the channel data to
respond to an open–circuit or short–circuit condition. This field reflects the
broken input type selected in bits 6 and 7 of the channel configuration word
when the channel is enabled. If the channel is disabled, these bits are cleared
(0).
Temperature Units Status (Bit 8)
The temperature units field indicates the state of the temperature units bit in
the configuration word (bit 8). This feature is only active for RTD input
types with the channel enabled. This bit is cleared (0) if the channel is
disabled or if the input type is a resistance device such as potentiometer.
Channel Filter Frequency (Bits 9 and 10)
The channel filter frequency bit field reflects the filter frequency you
selected in bits 9–10 of the configuration word when the channel is enabled.
This feature is active for all input types. If the channel is disabled, these bits
are cleared (0).