Automation interface & i/o controls, Source/sink inputs and outputs – Sonics GXT User Manual
Page 37
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I N S T R U C T I O N M A N U A L • M O D E L G X T P O W E R S U P P LY
35
SOURCE/SINK INPUTS AND OUTPUTS
Vendor terminology and specifications can be confusing as the reference is
easily misinterpreted. Does the vendor send a “Sourcing” signal or do they
mean that an input is ready to receive (or sink) current from an external
source? Some PLC vendors seem to contradict others and the applications
engineer ends up with a bank of relays or pull up/down resistors to switch
the signal type.
When the optical IC is placed into socket U42, the G series outputs (Ready,
Good Part, Bad Part, and the Spare DO) are configured as “Sourcing.” The
isolated transistor collectors must be connected to an external loop supply
(all 4 collectors are connected together; signal name +VDC Source (Input);
pin 18 on I/O Connector J3; cable wire – orn/red). Some PLC’s provide a
DC supply for this purpose, some applications will require a separate
supply.
When the G series output is true or ON, current from the loop supply is
conducted through the output transistor and limiting 100 ohm resistor to the
PLC input card which returns to the loop supply. The PLC input will be ON if
the current is flowing and OFF if the G series output is false or OFF.
Inputs (DI1-DI4) also set for "Source" as factory default.
See schematic drawing on page 40 for more detail.
AUTOMATION INTERFACE & I/O CONTROLS