Novanta v30, Руководство пользователя, Страница: 56 / 101

INTERFACE CONNECTIONS PAGE | 56
Figure 3-8 PLC switched Laser Enable circuit
DB-9 output circuitry
The Interface A (DB-9) connector has four user outputs that communicate laser status to the user’s control system. As described in Table
4-3, 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.
OEM v30 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.
The Interface A (DB-9) connector 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 DB-9 input circuitry subsection.
Table below provides DB-9 output circuit specifications while following figure illustrates the output circuit’s equivalent internal schematic.
Table 3-5 DB-9 output circuit specifications
Output Signals Output device type and specifications
Laser Ready 5V logic output buffer
Lase Indicator
On state Vmin +4.5 VDC @ 50
mA
Over temp Fault
On state (typical) +5.0 VDC @
0.5 mA
DC Voltage Fault Off state Vmax +0.8 VDC