INPUT/OUTPUT SIGNALS
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Output signals
I401’s five user outputs correspond to the status functions described below. These outputs are
optoisolated solid-state relays that allow for high-side or low-side switching. The shared connection,
Output Common, is separate from the laser’s chassis ground to allow high-side or low-side switching and
to isolate control signals for optimum EMI performance.
I401’s optically isolated outputs are useful for sending laser status to a Programmable Logic Controller
(PLC) or computerized control system. Each of the five outputs can source 50 mA at ±24 VDC
maximum for a total load of 250 mA. For controlling larger loads, use these outputs to drive a control
relay.
Important Note: Interlock Open and Shutter Open output signals are dependent control functions.
The Shutter Open output will not close (SHT LED On) until a Shutter Open Request signal is
applied and the Interlock Open output opens (causing INT LED to illuminate green and RDY LED to turn
On).
Pin 6 Laser Active
This bi-directional switched output is internally connected to Pin 13, Output Common, when the
laser is actively lasing (LASE indicator red). This output is open (high impedance) when no beam
is being emitted (LASE indicator Off). Refer to Table 3-5 for output circuit specifications.
Pin 7 Fault Detected
This bi-directional switched output is internally connected to Pin 13, Output Common, when (1) an
over-temperature fault (TMP LED is red) or (2) a No-Strike condition (blue SHT indicator is
flashing) has occurred. The output is open (high impedance) when laser operation is within limits
(TMP LED green and SHT LED blue). Refer to Table 3-5 for output circuit specifications.
Pin 8 Laser Ready
This bi-directional switched output is internally connected to Pin 13, Output Common, when the
laser is enabled (RDY indicator On), indicating that lasing will occur when a PWM Command
signal is applied to Pin 9 and Pin 1. When this output is initially switched closed, there is a five-
second delay during which lasing is inhibited. This output is open (high impedance) when the
laser is disabled (RDY LED Off). Refer to Table 3-5 for output circuit specifications.
Pin 13 Output Common
Use this pin to complete the return (ground) path for any output connection (Pin 6, 7, 8, 14, or 15).
The Output Common line is protected by a 0.3 A self-resetting fuse.
Pin 14 Shutter Open
This bi-directional switched output is internally connected to Pin 13, Output Common, when
Remote Interlock and Shutter Open Request signals are present (SHT LED blue and RDY LED
yellow), indicating that lasing is enabled. This output is open (high impedance) when the laser is
disabled (SHT LED Off). Refer to Table 3-5 for output circuit specifications.
Pin 15 Interlock Open
This bi-directional switched output is internally connected to Pin 13, Output Common, when
remote interlock input circuitry is open (INT indicator red), indicating that lasing is disabled. This
output is open (high impedance) when the laser is enabled (INT indicator green). When this
output is initially switched open, there is a five-second delay during which lasing is inhibited. See
table below for output circuit specifications.
