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Connecting Input Signals
Adept IO Blox User’s Guide, Rev B 29
3.4 Connecting Input Signals
The IO Blox has 16 optically isolated digital I/O channels (8 high-side driver outputs with
common source and 8 independent inputs). They are wired to terminal blocks located on
the IO Blox. See Figure 2-1 on page 7 . These terminal blocks also contain internally wired
jumpers to route ground and power signals, if desired.
NOTE:
In V+ systems, the IO Blox inputs cannot be used for REACTI
programming, high-speed interrupts, or vision triggers. See the V+
Language User' s Guide for information on digital I/O programming.
Input Specifications
NOTE:
The input current specifications are provided for reference.
Voltage sources are typically used to drive the inputs.
NOTE:
If using multiple power supplies, ground all the power supplies to
the same grounding point.
Table 3-1. IO Blox Input Specifications
Parameter Value
Style Two wire, individually optically
isolated, reversible current flow.
Operational voltage range 0 to 30 VDC
“Off” state voltage range 0 to 3 VDC
“On” state voltage range 10 to 30 VDC
Typical threshold voltage V
in
= 8 VDC
Operational current range 0 to 7.5 mA
“Off” state current range 0 to 0.5 mA
“On” state current range 2.5 to 7.5 mA
Typical threshold current 2.0 mA
Impedance (V
in
/I
in
) 3.9 K Ω minimum
Current at V
in
= +24 VDC I
in
≤
6 mA
Turn on response time (hardware)
Software scan rate/response time
5 µsec maximum
16 ms scan cycle/
32 ms max. response time
Turn off response time (hardware)
Software scan rate/response time
5 µsec maximum
16 ms scan cycle/
32 ms max. response time