Applied Digital ADICON 2500 SECU-16 I/O Module — Installation Manual

Installation and setup manual for the Applied Digital SECU-16 expansion module — adds 8 supervised/analog inputs and 8 low-current relay outputs to an ADICON control system.

Overview

The SECU-16 module allows 8 inputs and 8 low-current relay outputs to be added to an ADICON control system. Inputs may be supervised (switch closure), analog, or 4-20mA.

Specifications

Setup

1. Remove the SECU-16 top cover.
2. Connect the power supply to the two screw terminals labeled POWER.
3. Connect the COM A and COM B terminals to the ADICON bus.

Three types of inputs may be used: supervised, analog, and 4-20mA. A supervised input is a passive, non-current-supplying input such as a relay or switch. An analog input provides a varying voltage such as a light sensor.

Jumper Settings (P2–P9 control inputs 1–8 respectively)

To use an input as a supervised input, a 1K Ohm resistor (supplied) must be placed across the input.

Operation

ADICON LED Codes

• ACTIVE LED — Slow blink: Module has a valid address
• ACTIVE LED — Rapid blink: Auto address mode active
• COMMS LED: Blinks rapidly during ADICON communications

SECU-16 Parameters

Inputs and outputs are represented by I/O points within a module: the SECU-16 has 16 I/O points. Input 1 = I/O point #0, Input 2 = I/O point #1, etc. Relay 1 = I/O point #8, Relay 2 = I/O point #9, and so forth.

Supervised Inputs

A supervised input is a switch or relay type input. The SECU-16 reports OFF when the switch is open and ON when the switch is closed.

Analog Inputs

Analog inputs vary from 0–5VDC, such as a light sensor. The SECU-16 reads the analog input and compares the value to the low and high threshold parameters. If the analog value is between the low and high thresholds, the SECU-16 reports the input as OFF; if the value is lower than the low threshold or higher than the high threshold, it reports the input as ON.

Setting Threshold Values

Threshold and analog values are determined using the following formulas:

• Analog Reading = Sensor Voltage × (256 / 5) = Sensor Voltage × 51.2
  Example: a 2V input → 2 × (256/5) = 102
• Voltage = Analog Reading × (5 / 256) = Analog Reading × 0.01953
  Example: a reading of 192 → 192 × 5 / 256 = 3.75V

Threshold values are stored in parameters 2 and 3 (see table above) and are set using C-Max software.

Threshold values can also be used to perform reverse logic. For example, for an input to be OFF when closed and ON when open (such as a door sensor in a security system), set the low threshold to 0 and the high threshold to 128. For the input to report OFF when open and ON when closed, set the low threshold to 128 and the high threshold to 255. This works with either analog or supervised inputs.

Example: Light Sensor for Outside Lights

First determine the threshold voltages for turning the lights on and off. In the manual's example, 1.5V (analog reading 77) turns the lights on and 3.5V (analog reading 179) turns the lights off. The lights turn off after sunrise only if there is enough light, and turn on after dusk when dark enough. In this example, the more light on the sensor, the smaller the analog reading.