Figure 4-10 Plc Switched Laser Enable Circuit - Novanta vi30 User Manual

SAMPLE INPUT CIRCUIT
The figure below shows an isolated PLC output module switching the Laser Enable signal from a +5 V
source.
Output circuitry
The OEM vi30/40 has four user outputs that communicate laser status to the user's control system. As
described in the following table, the four outputs, Laser Ready, Lase Indicator, Overtemp Fault, and DC
Voltage Fault are ESD protected, but are not optoisolated. The Laser Ready output goes high (+5V)
when lasing is possible, otherwise the output is low (0V) when the laser is not ready. Lase Indicator goes
high when the PWM signal is sufficient to induce laser output and is low when no beam is being emitted.
Overtemp Fault goes high when laser temperature rises above its upper thermal limit; otherwise, the
output is low. DC Voltage Fault goes high when an under/over voltage condition is sensed; otherwise,
the output is low when the DC supply voltage is within limits.
The vi30/40 also includes a +5 VDC output voltage source, DC Out. This output can provide a maximum
current of 250 mA and is useful for driving the Laser Enable input as described in the Input circuitry
subsection.
The table below provides vi30/40 output circuit specifications while the figure on the following page
illustrates the output circuit's equivalent internal schematic.
Important Note: OEM vi30/40 outputs are voltage sources. Each output can source only 20 mA
typical, 40 mA maximum, to a ground referenced load (the ground reference, GND, is Pin 8). The
control board will be damaged if this current limit is exceeded.
Output Signals
Laser Ready

Figure 4-10 PLC switched laser enable circuit.

5V logic output buffer
Output device type and specifications
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