Transistor output transient pulses – Rockwell Automation 1769-BOOLEAN Compact I/O Module Reference Manual User Manual
Page 69
Publication 1769-RM016A-EN-P - July 2006
1769-BOOLEAN Module Specifications 69
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 figure below 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 duration decreases. Transients when you cycle
power do not exceed the time duration shown 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. Refer to your controller’s user manual to reduce
inadvertent operation.