Q26 – DATRAN II eXcel IO Expansion
Quick-Start Guide
DATRAN II eXcel –Q26 Quick Start Guide – v2.0 – September 2010
Module Address
As an IO expansion module that communicates with the master RTU (eXcel or QRTU) on
the RS485 bus, the module must have an address that is unique to that bus. The
expansion module is factory preset to address 3. Therefore if multiple expansion modules
are to be used on the same RS485 bus then their addresses must be configured. This is
achieved by setting a code on the block of 8 DIP switches located internally to the IO
expansion module casing.
The code for address is a binary code with switch 1 being the least significant bit. This
means that each switch has a numeric value associated with it, and the resultant address
is calculated when you add all the switch values that are in the “ON” state.
The module address can be any number between 1 and 239. The module address 0 is a
reserved address while module address 255 is used to re-load the factory default
configuration settings.
The value of each switch is as follows:
Module Address Switch Values
Switch Number 1 2 3 4 5 6 7 8
Value 1 2 4 8 16 32 64 128
For example, if a module needs an address of 22, the correct setting would be to have
switches 2, 3 and 5 on and the rest off. (2+4+16 = 22).
The back of the Q26 Users Guide has a full table of all valid addresses and their
corresponding DIP switch settings.
Status LED’s
ON : This green LED is always on when the module is powered.
OK : This green LED flashes on a 1 second cycle to show the CPU has not
locked up. If it is on solidly or stays off, then the eXcel needs attention.
IP : This yellow LED indicates that the module is currently sending comms
out its IPB port to communicate with the RTU.
ER : This red LED is the Error Indication LED. The LED will flash a certain
number of times to indicate any error messages the module has been
configured to display from Q90.
Number of
Flashes
Message
4 5
IPB
Comms
Fail
Digital
Outputs
Fail
DATRAN II eXcel –Q26 Quick Start Guide – v2.0 – September 2010
Supply Voltage and Connections
The module is able to operate from 12V - 30VDC.
The module power connector has three connections labeled “G”, “+” and “C”.
G Power Supply Negative
+ Power Supply Positive (12V – 30VDC)
C Option for remote power control from a
master RTU.
The “C” terminal is a control INPUT. Do not connect it to the supply
Digital Inputs
The module’s digital inputs are designed to interface easily with physical
switching devices. They have an internal pull-up resistor that will pull the
input terminal to the power supply ‘+’ when the input is open circuit (the
“OFF” state).
To turn a digital input ON, connect it (via a set of contacts if necessary)
to the common “G” terminal on the Digital Input terminal block. All “G”
terminals on the module are tied internally to the “G” terminal on the
power supply connector.
The module has 16 digital inputs with an LED associated with each. This
will illuminate when the input is Active/On/Closed.
The pull up / pull down convention is different from some PLCs. If required, the
active state of I/O can be inverted in the eXcel control program or PLC
DATRAN II eXcel –Q26 Quick Start Guide – v2.0 – September 2010
Digital Outputs
As with the Digital Inputs, the module Digital Outputs are designed to be easily interfaced
with relays and contactors.
The module has 8 Digital Outputs in total. The first four are
located on the front panel adjacent to the Digital Inputs and have
+ Supply
LED indicators to show if the output is active or not. The second
four Digital Outputs are located on the underside of the module
next to the power connector, labeled “Aux Out”.
RTU
The Digital Outputs work as “Current Sinks”. This means that
when they are turned on, they will be connected to power supply
Dig Out 1
ground, allowing current to flow into the output terminal to ground.
When in the “OFF” state, they have a high impedance to ground
and will float up to + Supply.
To use a digital output with a relay, wire as shown in the diagram
Factory Presets
When you receive your Q26 IO Expansion module it will be configured with the following
settings:
RS485 Address 3 (as configured by the internal dipswitch setting)
RS485 Baud Rate 9600
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