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Primary Control Unit
Date Last Saved: 4/23/2012 3:47:34 PM

Product Name(s): ASIC/2-7540
Product Description: The ASIC/2-7540 controller can be used for energy management and control systems including air handlers, chillers, cooling towers, pumps, or lighting. The ASIC/2-7540 controller is configurable and comes with a battery-backed clock. This controller can be configured to communicate peer-to-peer with other ASIC/2 controllers over the system bus. It can also poll ASIC/1 controllers on a separate local bus. The ASIC/2-7540 also has a USB port for use with an Ethernet adapter or modem.
Product Application(s): Applications range from autonomous control of small buildings to networked control of large buildings.
Point Quantity Characteristics
Analog Input (AI): N.A.
Digital Input (DI): N.A.
Universal Input (AI or DI): 16 0-5 VDC
4-20 mA
249 ohm resistor
NO/NC Binary
Analog Output (AO): 8 0-10 VDC
20 mA at 10 VDC
Protected with transient voltage suppressors
Digital Output (DO): 12 Form "A" Relay
Dry contacts
24 VAC or VDC, 2 A
Universal Output (UO):
Control Unit Model #:AIDIUIDOAOUOOther
ASIC/2-7540 16 12 8
A/D Converter Resolution
8 bit
10 bit
12 bit
16 bit
D/A Converter Resolution
6 bit
8 bit
10 bit
No Analog Output
HOA switches provided on each output?
Note: These are also available as an add-on from 3rd party vendors.
Both AO and DO
DO Only
Indicating status LED on each output?
AO and DO
AO Only
DO Only
Integral Flow Sensor? N.A.
Integral Damper Actuator? N.A.
Can controller accept occupant override from thermostat? N.A.
Can controller accept occupancy sensor input? N.A.
Expander Boards None
Network Ports, Protocol(s), and Speed(s) Supported
(Note: See 'Architecture' for network details)
(2) EIA-485 ports, Propietary system and local busses, system bus @up to 19.2 kbps, local bus @ up to 19.2 kbps
External Communication Ports, Speeds and Access Devices (1) EIA-232 port for modem connection or Etherlink connection
Optional USB Ethernet Adapter or Optional USB Modem for use in USB port.
Additional Information (Optional)
Network Accessing Capabilities via Controller
Access controller only
Access controller plus additional controllers on network segment / LAN
Access all controllers on system
No access available on this controller
Controller Access Devices
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted) ePAD display
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID) MobileXpert
Zone-Based port (details below)
Zone-Based Interface Access
Zone Interface Hardware
Zone-Mounted touchpad (thermostat or stand-alone display)
HID (proprietary device)
PDA (3rd party HID, with software)
Other Information not provided
*Note: This section covers the capabilities for accessing the controller or other parts of the network from the controller (i.e. 'bottom-up').
Standard access functionality is covered in the Architecture and Software sections.
**Does NOT include front-end OI functions. See vendor for specific functions available.
Functions Available Through Field Interface**:View ParamsChange ParamsChange
O&M SupportTAB/Cx Support
Local Display Panel (controller-mounted)
Local Display Panel (zone-mounted) ePAD display
Handheld Interface Device (proprietary device)
PDA (3rd-Party HID) MobileXpert
Zone-Based port (details below)
Microprocessor(s) Intel 80C196 microcontroller
Clock Type
Powered, battery-backed
Battery powered
Powered, no battery backing
Clock Synchronization The ASIC/2-7540 can broadcast time on the network to synchronize time on networks of ASIC/2 or ASIC/1 controllers.
Volatile Memory (RAM) Capacity 30 kbytes RAM
Volatile Memory (RAM) Uses
RAM use unrestricted
RAM use restricted as shown below
Information Not Provided
Program Execution / Calculation storage
Data / Trends / Alarms storage
Configuration / Parameter storage
Control Programming storage
Is Volatile Memory Supported By Battery? No
Battery Type(s) Information not provided
Battery Life Information not provided
Backup Battery Operating Time Information not provided
Non-Volatile Memory Capacity (EEPROM/Flash)* 30 kbytes NVRAM
128 kbytes Flash
Non-Volatile Memory Uses
Data / Trends / Alarms / Calculation Storage
Configuration / Parameter Storage
Control Programming Storage
Controller Operating System Flash contains firmware
Additional Information
* Items in NV memory are not lost upon power or battery failure. Other types of NV memory such as EPROM, NOVROM, etc. do not directly impact system performance.
Can trend data be stored in this controller? Yes
How many total trend values can be stored? 128 words, or 256 bytes for each trend.
Multiple trends based on memory available.
What is the controllers role in trending? Samples on periodic basis.
Can controller be programmed to 'push' data to archive or are trends 'pulled' from controller?
When full, does controller automatically send up trend data, overwrite data, or stop logging data? Rollover or stop depending on configuration.
Programming Method(s) Configured using ASI Visual Expert, a Windows based software application.
Resident vs Non-Resident Program Execution Resident
Resident/Supervisory. This controller supervises the scheduling of other controllers.
Resident/Stand Alone. This controller contains its own schedule.
Non-Resident. This controller is dependent upon another controller for its schedule.
None. This controller has no scheduling features.
Resident Energy Management
Energy management algorithms for this controller can be custom programmed Graphical Linking of objects.
Pre-programmed/built-in algorithms available, and are fully editable using custom programming
Pre-Programmed/built-in with limited editing via template-based programming
Controller is not typically used for energy management functions
Specific Pre-Programmed Algorithms Available
None (custom programming only)
None (not applicable)
Optimal Start/Optimal Stop Optimum Start Only
Peak Demand Limiting/Load Shedding Based on Demand
Economizer (enthalpy, dry-bulb, CO2, modulating/2-position, etc.)
Other Electrical Demand Management
Additional Energy Management functions are resident at SI
Additional Programming Functions
DDC Loops (P, PI, PID) PID
Automatic PID Tuning Feature Yes, Override of PID for Step Response to assist loop tuning.
Automatical-Dial Alarm Support Yes
Does controller perform multiple retries and buffer/store alarm until connection is made? Yes
Are multiple destinations possible? Yes
Upon controller power loss or hardware failure:
Are network communications affected? Other controllers can communicate.
Is loss recognized on/by the network and alarm reported? Controller fails to respond.
DO and AO response?
Outputs fail to a user pre-specified position
Outputs fail to a normal (unpowered) position
Outputs fail to last position
Volatile memory functions?
Retained for life of backup battery
Upon restoration of power does the controller:
Auto-reboot without operator intervention? Controller does power-up test and then resumes normal operation.
Automatically reset/synchronize the clock? Automatic synchronization.
Update all monitored functions? Dynamic Trends restart,
Static Trends continue.
Generate an alarm if backup battery is dead? No.
Upon network or communications failure does controller:
Continue to operate standalone? Controllers operate standalone.
Operate with last global settings or user-specified value? N.A.
Do broken network segments continue to communicate within the remaining segment?
(Note: May depend on proper termination of segments for higher speed networks.)
Yes, failed controller is skipped.
Does network automatically reconfigure upon restoration? No reconfiguration.
Does network store 'loss of communications' alarm with time of event? User Interface software can.
Additional Information (optional)
Self Test Diagnostics
Does controller have internal self-test diagnostics to check:
Processor failure? Information not provided
Internal hardware failure? Self test of internal memory, and power check on power-up.
Open/shortened sensor? Inputs have Fault Limits.
Control Enclosure Included
Power Supply Required Yes
Voltage 24 VAC +/- 15%
+/- 24 to 48 VDC
VA 18 VA plus loads
Surge Protection 0.75 A polyswitch
Underwriters Laboratories UL 916, Open Energy Management
FCC Meets FCC Requirements
CE Meets CE Requirements
LonMark Certified
No - but LonWorks compatible
Information not provided
BACnet (BTL) Certified
Not submitted for testing
Information not provided