User`s guide

Connecting Customer-Supplied Digital I/O Equipment
Adept SmartController User’s Guide, Rev. K 51
inputs that are used by the system for interrupts and latching. The outputs, although
independent, have a lower current rating of 100 mA compared to 700 mA for the extended
outputs on the sDIO (described in Section A.6 on page 75). See the V+ Language User’s
Guide for information on digital I/O programming.
The connector also provides 24 V pins for powering customer equipment. There are four
24 V pins and four ground pins, which are limited to a total of 1 A of current. The source
of the 24 V is the XDC connector on the front of the SmartController.
Input Signals
The XDIO connector handles input signals 1001 to 1012. Each channel has an input and a
corresponding return line. See the following table for input specifications. The connector
pin-outs are shown in Table 3-13 on page 55.
NOTE: The input current specifications are provided for reference;
voltage sources are typically used to drive the inputs.
NOTE: When the program task priorities are properly set, there is a 2 ms
maximum latency for fast inputs 1001 to 1008 when used with the V
+
INT.EVENT instruction.
In the following figure, example 1 shows inputs (1001 to 1004) with a negative common,
example 2 shows inputs (1005 to 1008) with a positive common, and example 3 shows
inputs (1009 to 1012) with an independent power supply (no common).
Table 3-11. DIO Input Circuit Specifications (XDIO connector)
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  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