Servoobs - Siemens SIMATIC S7-1200 System Manual

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Use the "Commissioning" control panel to test the functionality independently from your user

The control panel shows the current status of the axis. Not only can you enable and disable

the axis, but you can also test the positioning of the axis (both in absolute and relative terms)

and can specify the velocity, acceleration and deceleration. You can also test the homing

and jogging tasks. The control panel also allows you to acknowledge errors.

ServoOBs

When you create a technology object for S7-1200 motion control, the CPU automatically

creates the organization block "MC-Servo (OB 91)" for processing the technology objects.

The motion control functionality of the technology objects creates its own priority class, and

the SIMATIC S7-1200 execution system calls the OB according to the application cycle.

The MC-Servo OB is write-protected. You cannot change the contents.

The position control algorithms of all technology objects configured for motion control on the

CPU are calculated within the MC-Servo OB.

You can set the application cycle and the priority of the organization block in accordance

with your requirements for control quality and system load. Multiple ServoOBs can link to a

"CyclicServoEvent". The Property page of the MC-Servo OB shows the two changeable

values of the CyclicServoEvent:

● Priority number

● Cycle time

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Click the "Startup" icon to commission the axis.

Technology instructions

"Standstill signal": You can configure the

following parameters:

• Minimum dwell time in standstill window

• Standstill window.

"Control loop": You can configure the veloci-

ty gain known as "Precontrol (Kv factor)".

10.3 Motion control