46
SmartController EX User's Guide
11069-000 Rev. H
4.6 Connecting User-Supplied Digital I/O Equipment
Table 4-12. Digital I/O 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
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
1 ms scan cycle/
1 ms max response time
Turn-off response time (hardware)
Software scan rate / response time
5 µsec maximum
1 ms scan cycle/
1 ms max response time
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 1 ms max-
imum latency for the fast inputs when used with the eV+ INT.EVENT instruc-
tion.
The following figure shows inputs 1001 to 1004 with a negative common, inputs 1005 to 1008
with a positive common, and inputs 1009 to 1012 with independent power supply con-
nections (no common).
NOTE:
These are examples. Either method can be used on any channel.
