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2 Explanation of the Blocks

2.4 FB20 "Parameter_Access"

Other switch-on conditions

To be able to switch on the drive, the following bits have to be additionally set in

the control word (STW1):

Table 2-8: SERVO: Other switch-on conditions

STW1

Bit 03

Bit 04

Bit 05

Bit 06

Bit 10

The above bits are set to TRUE by the FB13. They do not have to be supplied by

you.

2.4

FB20 "Parameter_Access"

2.4.1

Describing the block

The FB coordinates the acyclic parameter transfer between the PLC and the

respective drive object of the SINAMICS S120 on the basis of a data exchange that

is based on the data structure of "data record 47"

S120 drive object jobs for read-out or for changing the inverter parameters and

responses received, embedded in this structure. They may include error detection

if applicable, and the requested parameters if it was a read job.

With the help of the FB20 block input parameter you specify...

the address of the drive system (=address of the CU),

you would like to address,

the source address of the order data records in the PLC,

the target address of the response data records in the PLC,

Via the content of the order data record (data record 47) you specify...

the drive object number within the drive system

the function (change or read out parameters)

the number of parameters

the parameter number,

the parameter index (if present),

the parameter data type

You can simply use the FB20 in independent applications. You should call it

cyclically in OB1 or in OB3x.

SINAMICS S120 Function manual (\7\),

SINAMICS S120 Function manual (/7/),

Chap. 11.1.4.2 Acyclic communication > Structure of orders and responses

SINAMICS S120 at S7-300/400F

Entry-ID: 68624711,

V1.1,

Enable operation

Enable ramp function generator

Continue ramp function generator

Enable setpoint

Master control by PLC

12/2014

. Send the respective SINAMICS