User Manual

Motion control is easy
10.3 Configuring the axis
Easy Book
Manual, 03/2014, A5E02486774-AF
211
Note
Configuring a pulse generator to signal board outputs:
Select the "Pulse generators
(PTO/PWM)" properties for a CPU (in Device configuration) and enable a pulse generator.
Two pulse generators are available for each S7
-1200 CPU V1.0, V2.0, V2.1, and V2.2.
S7
-1200 CPU V3.0 and V4.0 CPUs have four pulse generators available. In this same
configuration area under "Pulse options", select Pulse generator used as: "PTO".
Note
The CPU calculates motion tasks in "slices" or segments of 10
ms. As one slice is being
executed, the next slice is waiting in the queue
to be executed. If you interrupt the motion
task on an axis (by executing another new motion task for that axis), the new motion task
may not be executed for a maximum of 20
ms (the remainder of the current slice plus the
queued slice).
10.3
Configuring the axis
STEP 7 provides the configuration tools, the commissioning tools, and the diagnostic tools
for the "Axis" technology object.
①
Drive
④
Commissioning
②
Technology object
⑤
Diagnostics
③
Configuration
Note
For CPU firmware releases V2.2 and earlier, the PTO requires the internal functionality of a
high
-speed counter (HSC). This means the corresponding HSC cannot be used elsewhere.
The assignment between PTO and HSC is fixed. If PTO1 is activated, it will be connected to
HSC1. If PTO2 is activated, it will be connected to HSC2. You cannot monitor the current
value (for example, in ID100
0) when pulses are occurring.
S7
-1200 V3.0 and later CPUs do not have this restriction; all HSCs remain available for
program use when pulse outputs are configured in these CPUs.