Analog Inputs-
AI1 and AI2 are provided for analog inputs. The 4-20mA sensor output should be connected
to AI1 or AI2 terminal and other end is to be connected to GND.
Digital Outputs-
SA246 supports6 digital outputs with two potential free NO-NC contacts for each output. The
contact rating is 230V / 15A.
So appropriate capacity load can be switched using these outputs. Whenever unit is powered
off, DO status falls back to NC status and is restored to last condition upon resumption of
power.
OPERATION
At power on, unit beeps twice and power LED glows steady. The unit checks for range and
range LED 1 blinks while the unit gets the range. When the range is found, LEDs become
steady. In good range, all 3 LEDs glow. In medium range, only 2 LEDs will glow and in low
range, only 1 LED will glow.
Unit then starts scanning inputs and report alarm as and when it detects change of input state.
When SMS to activate output is received, it changes the output state.
VE SA 246M has 4 inputs DI1 ~ DI4 and two common GND terminals. The four potential free
contacts must be connected to these inputs. The inputs are configurable as NO (Normally
Open) or NC (Normally closed) or bi-state inputs in normal condition. When any input changes
its state, SMS for that input is sent to the configured reporting numbers. All numbers are
reported one after another. The unit can send 4 different SMS messages for each input and
the English text is also configurable. SMS text can be maximum 120 characters.
VE SA 246M supports two analog inputs AI1 and AI2 with one common GND terminal. Analog
inputs can be set to indicate alarm on crossing low or high levels set in %. Two alarms can be
set –Lo alarm and Hi alarm. When input to that analog channel goes below low level or goes
above high level, alarm SMS corresponding to that analog input is sent to reporting numbers.
The status of each input channel is sent periodically to the reporting numbers along with data
received from Modbus slave device. Also status message of input channels are sent indicating
channel is in alarm or in normal state. The period of reporting is also configurable from 01 ~
24 hours. If this value is set to zero, periodic status reporting is disabled. The instantaneous
status can also be obtained on demand by user, by sending a SMS to the unit.
Any configuration of unit can be done through two authenticated numbers only. These
numbers can be changed at site. At factory shipping time, default number is configured as per
user request / blank.
When unit receives pre-formatted SMS messages, it acts per the message command. The
configuration can be changed only through authenticated numbers; whereas general status
read can be done through any number. Device continuously poll Modbus data and will send
an SMS automatically when there is change of data and also at periodic time interval
configured by user to receive periodic status. Total of 5 Modbus queries can be preconfigured.
