AM3-SM Programmable I/O for Modbus RTU

Control Solutions’ Model AM3-SM AddMe® III Programmable I/O for Modbus RTU is a network I/O device that makes an excellent slave I/O device. The AM3-SM can also function as a stand-alone soft PLC.

AddMe III Series
Model AM3-SM
Network I/O for Modbus RTU

• 18 Analog/Universal Inputs
• 4 Analog Outputs
• 8 Discrete Outputs
• 2 Discrete/Pulse Inputs
• Modbus RTU Slave
• Freely Programmable

AddMe® III Network I/O

Powerful. Flexible
Economical. No Software to Buy.
Free Graphical Programming Tools.
Easy to Configure Yourself.

AddMe® III AM3-SM Network I/O for Modbus RTU

Order code: AM3SM
List price: $850.00
Your price: $680.00
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Control Solutions’ AddMe III features 18 universal inputs which are context sensitive. When configured as an analog input, the continuously self-calibrating sigma-delta converter produces 15-bit resolution with high noise immunity. When configured as a discrete input, the converter switches to 8-bit resolution at 128 samples per second for fast response. All I/O points are accessed as Modbus holding registers.

Floating point holding registers provide data from the analog I/O points. In addition, analog (universal) inputs are mirrored to integer registers and may be treated as on/off values. Linearization tables are provided for 10K and 20K type II, III, and IV thermistors. Input type and scaling is configured by writing to additional holding registers.

Screen shot from AM3-SM Programmable I/O for Modbus RTU configuration tool

The AddMe III Configuration Tool is a user friendly configuration tool that provides simple templates for reading and writing the Modbus registers that configure the device. Connect the AddMe III to your laptop via any RS-485 adapter on your PC's COM port. .

i.CanDrawIt® is available at no additional cost for use with AddMe III controllers from Control Solutions. i.CanDrawIt® works just like an electrical schematic CAD program, except you draw control programs that look like circuits. The resulting software will function like the circuit you draw. i.CanDrawIt® includes visual program simulation as well as visual live debugging where supported by the target device. Set breakpoints or step through the program one visual function block at a time. Update variables and I/O objects in simulation or live.


AM3-SM Features

• 18 Analog/universal inputs
    • 0-10VDC, Thermistor, dry contact
    • Software selectable input type
    • 0.1% reference, up to 16-bit resolution
    • Continuously self-calibrating sigma-delta converter
• 4 Analog outputs
    • 4-20mA (0-20mA)
    • 8-bit resolution
• 8 Discrete outputs
    • Form A relay, 5A @ 120VAC
    • HOA switches & LED status indicators
• 2 Pulse/Discrete inputs
    • TTL to 24VDC
    • Rate or totalizing count input
• Modbus RTU RS-485 Slave
• Powered by 18-30VDC or 24VAC 50/60 Hz
• Power Consumption:
    • 0.3A @ 24VDC max.
• DIN rail mounting, 100mm H x 155mm W x 60mm D
• LED indicators for power, RS-485 RX/TX & error
• Pluggable screw terminal blocks
• -30C to +70C, 5%-95% RH non-condensing
• Certifications: FCC, CE


• AM3-SM Support Package
Contains configuration tool software, USB driver, documentation.
• Download Copy of AM3-SM Online Help

• Modbus Tutorial
Introduction to Modbus, including function codes, exception codes, register numbering.

Our most extensive technical support is provided by the same engineering staff that developed the products. Your personal attention from this staff is available via the support ticket system.

No user/password is required to open a new ticket. Once you open a ticket, you will immediately receive an email with your ticket number. Your ticket number becomes your login to review your ticket(s) later. Click the Support Ticket icon anywhere you see it. (If you do not get an email with your ticket number, within minutes, check your junk folder, spam settings, etc, and try again if necessary.)

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