Rockwell-automation 900 Temperature Controller Communications Function Manuel d'utilisateur télécharger pdf (Page 72)

Publication 900-UM004D-EN-E - July 2010

4-14 Modbus Communications Procedure

Example Command and Response

The following example shows the command/response when writing the

Upper-Limit Alarm 1 and Lower-Limit Alarm 1 parameters. (In this case, the

slave address is H’01.)

• Four-Byte Mode

Upper-Limit Alarm 1

· Address: H’010A Write data: H’000003E8 (when 1,000)

Lower-Limit Alarm 1

· Address: H’010C Write data: H’FFFFFC18 (when −1,000)

Figure 4.13

• Two-Byte Mode

Upper-Limit Alarm 1

· Address: H’2105 Write data: H’03E8 (when 1,000)

Lower-Limit Alarm 1

· Address: H’2106 Write data: H’FC18 (when −1,000)

Figure 4.14

01 10 01 0A 00 04

01 0A 00 04

00 00 03 E 8 FF FF FC 188D E9(CRC-16)

01 10

E0 34(CRC-16)

Command:

Response:

Command:

Response:

01 10

10 21 05 00 02

03 E8

5BF5 (CRC-16)

21 05 00 02 04 FC 18

66BB (CRC-16)

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 102 103

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Rockwell-automation 900 Temperature Controller Communications Function Manuel d'utilisateur Page 72