TTX Series DC Actuator Installation & Maintenance Instructions |
19
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4.7 DIGITAL INPUTS
Tritex TTX digital inputs are single ended positive voltage inputs
with negative side all to I/O Common. Standard I/O (-SIO in
model) and Ethernet options have 8 inputs, and the 4-20 mA
I/O (-IA4 in model) have 4 inputs. Since they require a positive
voltage to turn on, they are directly compatible with sourcing
outputs only. The voltage for each input can be sourced from
any supply with the negative side tied to I/O Common. Typically,
this is an external 24 V supply used for digital outputs. Each
input can be assigned to any of the internal input functions
using Expert software. It is important that the external power
source common is connected to PE.
Figure 17
–
Input Wiring with External 24 Vdc Power Supply
Digital Input Specifications
Description
Specification
Absolute Max Input Voltage*
-10-40 Vdc to I/O Common
Operating Input Voltage Range
0-30 Vdc to I/O Common
On state voltage range
10–30 Vdc
Off state voltage range
0–1 Vdc
On state current
10 V (min)
24 V (nominal)
30 V (maximum)
3.3 mA
5.0 mA
5.7 mA
Effective Load Resistance
(24 V)
4.8 kΩ
Off state current (max)
1.0 mA
Update rate
1 ms (typical)
* Inputs are protected from switching transients. Sustained voltage
outside the Absolute Max range may damage the circuit.
CAUTION!
Each output is rated to continuously drive a
100 mA load and is short protected at 500 mA with automatic
reset after the short fault is removed.
Figure 18 –
Wiring of outputs with external 24 V supply for
connection to PLC or any load
Digital Output Specifications
Description
Specification
Absolute Max Voltage
on Output*
-50 Vdc to 0 V measured to
I/O Power +
Operating voltage range
for I/O Power +
12 to 30 Vdc to I/O Common
(24 V ±10% with brake)
On state maximum
continuous current
100 mA
On state voltage drop
(@ 50 mA)
0.5 V typical
Short circuit protection
(auto reset)
0.5 A
Update rate
1 ms
* Outputs are protected from switching transients, including
kick from ordinary inductive loads. Sustained voltage outside
the Absolute Max range may damage the circuits. Note that an
output should not be driven more positive than I/O Power +.
4.8 DIGITAL OUTPUTS
Tritex TTX digital outputs are the sourcing type with power
from the I/O Power+ (“IO+V”) terminal. SIO and Standard I/O
(-SIO in model) and Ethernet options have 4 outputs, and the
4-20 mA I/O (-IA4 in model) have 3 outputs. The outputs have
a weak pull-down resistor to I/O Common (“IOCom”) terminal
just to prevent leakage current creating a floating voltage on
an output. Typically power comes from an external 24 V supply
used for digital I/O. It is important that the external power
source common is connected to PE. Outputs have short circuit
and thermal protection, and protection against inductive kick
at turn-off. Each output can be assigned to any of the internal
output functions using Expert software.
