Rockwell Automation 1769-OB32T Compact 32-point Solid-state 24V dc Source Output Module - Manual (Page 20)

20 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN080A-EN-P - August 2006
Transistor Output Transient Pulses
The maximum duration of the transient pulse occurs when minimum load is
connected to the output. However, for most applications, the energy of the
transient pulse is not sufficient to energize the load.
The Transient Pulse Duration as a Function of Load Current graph illustrates that
the duration of the transient is inversely proportional to the load current. Therefore,
as the on-state load current increases, the transient pulse decreases. Power-up
transients do not exceed the time duration shown below, for the amount of loading
indicated, at 60 °C (140 °F).
Transient Pulse Duration as a Function of Load Current
ATTENTION
A transient pulse occurs in transistor outputs when the external dc supply
voltage is applied to the output common terminals (for example, via the
master-control relay). The sudden application of voltage creates this
transient pulse. This condition is inherent in transistor outputs and is
common to solid state devices. A transient pulse can occur regardless of the
controller having power or not. Refer to your controller’s user manual to
reduce inadvertent operation.
0.4
1.0
0.9
0.8
0.7
0.6
0.5
0.3
0.2
0.1
0.0
1000 900 800 700 600 500 400 300 200 100 1
30519-M
On-State Load Current (mA)
Time-Duration of transient (mS)