ControlWave Instruction Manual (CI-ControlWave)
Figure 3-23. 4-20mA Current Loop AO - Wiring Diagrams
Software Configuration
To use data from any ControlWave analog output module you must
add a
CW_AO8
board in ControlWave Designer’s I/O Configurator,
and then configure it. See the
ControlWave Designer Programmer's
Handbook
(D5125) for more information. That same manual includes
an
I/O Mapping
section that describes, for advanced users, the I/O map
for this module.
AO with Readback in a Redundant System
Variables in the ControlWave project govern how inconsistencies
between the online AO module and the standby AO module are
handled in redundant systems with AO readback. Information on
configuring system variables is included in the
ControlWave Designer
Programmer’s Handbook
(D5125).
If there is a difference of more than 0.5% (of span) between the value
of the online and standby AO values, a variable will be set TRUE. For
local I/O boards, this is a system variable that follows the format:
_RDN_IO_
n
_ERR
where
n
is the I/O slot number of the AO module.
For boards residing in an I/O expansion rack, instead of a system
variable, this indication is provided by a variable mapped by the
_ER_STAT virtual status board. By default, the name of the variable
follows one of two possible formats.
ERSTAT_
n
_RDN_IO_
x_
ERR
ERST_
n_
RDN_IO_
x
_ERR
where
n
is the I/O slot number of the virtual ER_STAT board, and
x
is
the I/O slot number of the analog output module. See the
I/O
Configurator
and
I/O Mapping
sections of the
ControlWave Designer
Revised Nov-2010
I/O Modules
3-27
Содержание ControlWave
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