Siemens S7-1500 G120 Speed Control Using FB285 (SINA_SPEED) Programming Guide

About this manual

The document describes the SINAMICS drive library available in TIA Portal, which provides function blocks such as SINA_POS (FB284) and SINA_SPEED (FB285) for cyclic data exchange between a Siemens PLC and a G120/S120 drive. FB285 enables speed control via standard telegram 1 and includes pin definitions for inputs and outputs.

Step‑by‑step configuration instructions cover creating a new S7‑1500 project, adding the PLC and G120 devices, setting IP addresses, inserting the FB285 block into OB1 (or a cyclic interrupt OB like OB32), assigning variables to the block pins, downloading the project, and using a monitoring table to command and read the drive speed. Precautions about telegram selection and avoiding conflicting function blocks are also provided. This manual is written in Chinese.

What's inside

• Overview
• SINA_SPEED (FB285) Function Block Description
• Configuration Steps for S7-1500 to Control G120 Speed
• Function Block Pin Assignments
• Precautions

Specifications

Frequently asked questions

Which OBs can call the FB285 function block?

FB285 can be called in the cyclic task OB1 and in cyclic interrupt OBs such as OB32.

What standard telegram must be used for speed control?

Standard telegram 1 (PZD2/2) must be selected for the G120 device.

What must be consistent between P2000 and FactPRM?

The value set in the drive’s P2000 parameter must match the value assigned to the FactPRM pin.