Eaton easyE4 series Manual page 289

6. Function blocks
6.1 Manufacturer function blocks
Operating principle
You can use the pulse output function block to generate a defined number of pulses at
device output Q1 or Q2.. This series of pulses is called a pulse train. You can change the
frequency within the pulse sequence. You can generate several pulse sequences in
defined intervals. You can use these pulse trains to control a stepper motor in the three
possible individual sequences: acceleration, operation, and deceleration. The function
block also has Jog mode as well as normal mode.
Each function block is assigned a set device output for the fast pulses:
Function block PO01: -> device output Q01
Function block PO02: -> device output Q02
The device outputs Q01 and Q02 used must not be processed again in the circuit dia-
gram. The reason for this is that the PO function blocks overwrite all other status
changes at the device outputs Q01 and Q02.
A suitable power output stage that is compatible with the stepper motor being used is
required in order to be able to drive the stepper motor.
You then feed the step and direction data to the input logic of the driver. The input logic
for both signals should be optocoupled and process an input voltage of +24V.
The parameter definition for a stepper motor and therefore the function block largely
depends on the rated load to be moved. This defines the framework for the maximum
start and operating frequency.
The function block is active if the PO..EN coil is actuated. After you have parameterized
the function block, you can actuate the coil PO..S_. This will start normal operation.
Alternatively, you can also actuate the coil PO..TP and start the function block in Jog
mode.
Operating modes
Jog mode
You can use the PO in jog mode for commissioning. You can either start a positioning job
with a specified number of steps or a specified jog frequency.
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