Rockwell Automation 61C542 Voltage Input module - Manual (Page 30)

4Ć12
Bit 7 defines whether or not square root extraction is enabled for the
channel specified in register 23. The default condition (0) disables
square root extraction. When square root extraction is enabled, you
must be in unipolar mode. The square root function provides flow
information directly from a differential pressure input.
If the specified channel has square root extraction enabled and does
not use engineering units, the flow information provided is in the
range of 0 to +4095. The data returned represents the following ratio:
Data Flow
4095
=
Flow (Maximum)
Set the Maximum Scaling Register (register 24) to 10000 in order to
read the flow information in steps of 0.01%:
Data Flow
10000
=
Flow (Maximum)
You can also set register 24 to the maximum flow value. This will allow
a direct indication of flow.
Bit 8 defines whether the channel specified in the channel number
register (register 23) is a singleĆended channel or is the first channel
of a differential pair. The default is (0), which represents a
singleĆended channel. Note that when you are changing between the
differential and singleĆended modes of operation, you must first reset
the channel's configuration.
Bit 9 defines whether the channel specified in the channel number
register (register 23) is to be treated as bipolar (-10V to 10V range) or
unipolar (0 to +10V range). The default is (0) which represents bipolar.
Bits 10 and 11 are reserved for future use.
Bits 12 to 15, when equal to 0, enable the READY state, which is the
default condition. When the module is in the READY state, it is ready
to receive a configuration command.
When bits 12 to 15 are set to a binary value of 1, 2, or 3, their
operations refer to the channel specified in register 23:
D A binary value of 1 (RESET) resets the channel's configuration by
clearing its corresponding channel input register and resetting its
corresponding bit in the status registers (registers 16Ć21). When
resetting a differential pair, register 23 must contain the first (even
number) channel of the pair, otherwise, a channel number error"
configuration error will result.
D A binary value of 2 (READ) reads the channel's current
configuration information in memory and loads it into registers 24
to 30. When reading a differential pair, register 23 must contain the
first (even number) channel of the pair, otherwise, a channel
number error" configuration error will result.
D A binary value of 3 (WRITE) transfers the channel's configuration
information (registers 24 to 30) into the module's memory,
configures the channel, and then sets the corresponding bits in
the status registers (registers 16Ć21). If bit 8 is set to 1 (indicating a
differential pair), then register 23 must be the first (even number)
channel of the pair, otherwise, a channel number error"
configuration error will result.
When bits 12 to 15 are set to a binary value of 4 or 5, they reflect the
AĆC power line frequency. The default is 60 Hz.