Specifications

Chapter 3 – Input/Output Interfaces
102 PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Boo
k
Triggered Count Output
A timer/counter can be configured to generate an output pulse that is asserted under program control, and de-asserted
when a programmable number of input edges (up to 65,535) has been counted on an input pin (IO4 – IO7). Assertion
can be either logic high or logic low. This object is useful for controlling stepper motors or positioning actuators which
provide position feedback in the form of a pulse train. The drive to the external device is enabled until it has moved the
required distance, and then the device is disabled (see Figure 3.56).
Symbol Description Typ @ 10MHz
t
fout
Function call to output pulse 109 µs
t
cod
Last negative sync
Clock edge to output inactive
min 550 ns
max 750 ns
t
ret
Return from function 7 µs
Figure 3.56 Triggered Count Output Latency Values
The active output level depends on whether or not the invert option was used in the declaration of the function block.
The default is high.