UM1M820BNA User Instructions
Issue AH, March 4, 2013 Spec No. 1M820BNA (Model M820B)
Spec No. 1M820DNA (Model M820D)
10 Chapter 1. Introduction
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1.3.9 PLC (Programmable Logic Controller) Function The PLC function allows a User to create "control program lines" by combining equipment analog signals,
parameters, and alarms in a sequence that controls equipment and/or operates relays.
Control program lines are created using the WEB Interface. See “4.8.6. PLC Sub-Menu”.
Available logical components are:
Logical Component
Description
Logic NOT
NOT; Returns the inverted value of the input signal/parameter.
Logic OR
OR; Returns active (true) if any of the two signals/parameters are active (true).
Logic AND
AND; Returns active (true) if both of the two signals/parameters are active
(true).
AndOr
XOR; Returns active (true) if one and only one of the two signals/parameters
are active (true).
Greater Than (>)
GREATER THAN; Returns active (true) if the analog input signal goes above
the set threshold. Returns inactive (false) if the input signal goes below the set
threshold minus hysteresis value.
Less Than (<)
LESS THAN; Returns active (true) if the analog input signal goes below the set
threshold. Returns inactive (false) if the input signal goes above the set
threshold plus hysteresis value.
Delay
DELAY in seconds; Delays the applied signal/parameter with the defined time in
seconds before applying it to the output.
Various devices (supervisory modules) can be connected to the ACU+ Controller to extend its monitoring
capabilities.
Hybrid Control is designed for use in new installations or as an upgrade of existing sites powered by a
diesel generator(s) when grid power is not available. The Hybrid Control is also applicable to sites with
highly unreliable or frequently unavailable grid power connection. The primary power source is still
considered to be the diesel generator(s).
Note: The Hybrid Control function requires a specific configuration. Hybrid Control menus will not
normally be displayed unless your ACU+ has been configured by Emerson for this function.
Contact Emerson for a Hybrid Control configuration.
General
Hybrid Control allows the option of selecting one of the following: Fixed Daily Time based operation or
Capacity Discharge based operation.