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4 parameter examples, 1 writing a four byte parameter, 2 writing a two byte array parameter – Hitachi SJ-PB(T) User Manual

Page 21: Chapter5 operating

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CHAPTER5 OPERATING

17

5.4 Parameter Examples

5.4.1 Writing a four byte parameter

In this first example, PPO1 is used to set parameter F002 (1

st

Acceleration time 1) to 4.00 seconds. Also, a Start

command and a frequency set-point (50%) is given.
Please note: When reading/writing parameters via the Profidrive profile the cross-reference list must be used,
see chapter 5. For example, parameter F002 (1

st

Acceleration time 1) have parameter number 23 (17h) on

Profibus

.

PKW

PZD

Word

1

PKE

2

IND

3

PWE

4

PWE

5

STW
ZSW

6

HSW

HIW

Request:

PLC->Inverter

30 17

00 00

00 00

01 90

04 06

04 7F*

20 00

Response:

Inverter->PLC

20 17

00 00

00 00

01 90

03 31
03 37

20 00

In the request message the first two bytes are used for parameter identification. The first digit (2) denotes the
function “Change parameter value (long word)” (refer to chapter 3.2). The second digit along with the second
byte (0 and 17) indicates parameter number 23. Bytes 7 and 8 (01 90 = DEC 400) is the parameter value (400
meaning 4.00 seconds). The last four bytes are the Control Word and Frequency set-point. Control Word value
04 06 -> 04 7F* starts the motor, while 20 00 (refer to 5.3.2) signifies 50 % of the maximum frequency specified in
parameter A004.
In the response message, the first digit (2) indicates the function “Transfer parameter value (long word)”. Value
(01 90 in bytes 7 and 8) and parameter number (x0 17) are mirrored from the request. The last four bytes are
Status Word and Actual frequency (%).

5.4.2 Writing a two byte array parameter

In this second example, we are configuring PZD3 to contain the value of parameter A038, “Jogging frequency” in
the responses from the inverter to the master (PLC). PPO2 is used. On Profibus parameter A038 corresponds
to parameter number 61 (3Dh). This is configured with parameter number 916 (394h), “Assignment of PZD read
word” (see also chapter 5.3. and 5.5).

PKW

PZD

Word

1

PKE

2

IND

3

PWE

4

PWE

5

STW
ZSW

6

HSW

HIW

7

PZD3

8

PZD4

9

PZD5

10

PZD6

Request:

PLC->Inverter

73 94

01 00

00 00

00 3D

04 06
04 7F

20 00

00 00

00 00

00 00

00 00

Response:

Inverter->PLC

43 94

01 00

00 00

00 3D

03 31
03 37

20 00

01 F4

00 00

00 00

00 00