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Q23 Expansion Module Page 29
CONNECTIONS
This section describes the function and connections to the various connectors on the Q23 Module.
Power Supply
The Q23 Module is designed to operate with DC power supply voltages of nominally 12 or 24 volt. The Q23
Module will operate on any DC power supply voltage within the range 11 to 28 volts. The Q23 Module draws
approximately 80mA at 12 volts and 60mA at 24.0 volts power supply input voltages.
The power connector is located on the lower panel of the Q23 Module and is labelled
‘PWR’
. The terminals of the
power connector are:
G Ground, negative lead of supply.
+ Positive lead of supply
C Optional remote power control line.
Note The
‘+’ switched positive output is also present on the ‘+’ connectors of the ‘ANALOG I/O’, ‘DIGTAL OUT’
and
‘AUX OUT’ connectors. This ensures that attached peripheral devices also power down during
remote power control shut down and therefore do not ‘back feed’ power to the Q23 Module.
The DC power supply to the Q23 Module must be adequately smoothed and free from noise and voltage transients.
Where the DC supply is derived from the AC mains, or batteries with an associated AC mains battery charger these
devices must comply with the relevant electrical regulations.
The optional remote power control line is used to remotely power up and power down the Q23 Module. This line is
usually connected to the switched positive power output line of an associated Q22
– DATRAN II eXcel Module.
With power applied to the module, applying a voltage in excess of 10 volts to the remote power control line will
power up the Q23 Module.
Note Refer the Technical Notes section for more details on the remote power control function.
Digital Inputs
The Q23 Module has 8 digital input channels. These are available at a 9 way connector labelled
‘DIGITAL IN’
on
the front panel of the Q23 Module. The digital input channels are numbered 1 to 8. The terminal
‘G’
is a system
ground connection.
❖
A digital input channel is in the ON state when the corresponding input terminal on the digital inputs
connector is grounded, i.e. connected to the
‘G’
terminal on the digital inputs connector.
❖
A digital input channel is in the OFF state when the corresponding input terminal on the digital inputs
connector is open circuit or at the supply voltage potential.
Note
The input voltage to any digital input should not be allowed to go above the module’s power supply voltage.
The digital input can be switched with a variety of devices. These can include mechanical switches, solid-state
switches, transistors, transducers, etc.
Digital Outputs
The Q23 Module has 8 digital output channels:
❖
Digital output channels 1 to 4 are available at a 6 way connector labelled
‘DIGITAL OUT’
on the front panel
of the Q23 Module. The digital output channels are numbered 1 to 4. The terminals labelled
‘+’
are
connected to the switched positive rail
of the module’s power supply.
❖
Digital output channels 5 to 8 are available at a 6 way connector labelled
‘AUX OUT’
on the bottom panel
of the Q23 Module. The digital output channels are numbered 5 to 8. The terminals labelled
‘+’
are
connected to the swi
tched positive rail of the module’s power supply.
In the ON state a digital output channel is shorted to ground. In the OFF state a digital output channel is open
circuited. The digital output channels are capable of switching 1 amp at up to 26.5 volts. The output voltage is
clamped at 65 volts during inductive switching eliminating the need for reversed biased diodes across inductive
loads.