ControlWave Instruction Manual (CI-ControlWave)
3.7 Analog Output (AO) Modules
AO modules support eight 4–20 mA analog outputs. AO modules
consist of an AO PCB (with a daughter board when configured for read-
back) an LED board, a terminal housing assembly, as well as I/O
assembly and mounting hardware.
Table 3-8 Analog Output (AO) Module General Characteristics
Type Number
Supported
Characteristics
Analog Outputs
(AO)
8
Each AO supports:
4–20mA output with a maximum
external load of 650 ohms.
Analog output circuitry isolated from
bus interface
Surge suppression
Analog Output with
Read-back
Analog output modules with eight outputs are available in two versions
– standard AO, or AO with read-back capability for use in redundant
systems. Both versions may be used in redundant systems; however,
they operate differently.
An AO with read-back module operating in online mode monitors the
AO values of its standby counterpart in order to verify that standby AO
values are consistent should a failover occur. Depending upon software
configuration settings; a failover can be prevented if they are
inconsistent. A standard AO module used in a redundant system does
not perform this monitoring; therefore the potential exists to failover to
a backup AO module with failed hardware. For critical processes, the
redundant AO with read-back capability is recommended.
Use the same AO module type in any redundant pair – i.e. do not
install an AO with read-back module in the primary controller and a
standard AO module as its redundant counterpart in the backup
controller, or vice versa.
See Software Configuration later in this section for details on setting
up AO with readback.
Detailed Technical
Specifications
For detailed technical specifications, please see document CWPAC
available on our website http://www.emersonprocess.com/remote.
Configurations
The isolated AO module (general part number 396353-XX-X) has the
following configurations:
3-24 I/O Modules Revised Nov-2010
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