Application sequences, 2 zero calibration – KROHNE MFC 400 Modbus User Manual
Page 29
APPLICATION SEQUENCES
6
29
MFC 400
www.krohne.com
05/2013 - 4002525102 - AD Modbus MFC 400 R02 en
6.2 Zero calibration
• The example assumes slave address 1 for Modbus telegram.
• Substitute "xx xx xx xx" with value read from Input Register 20001.
1
Start
6a
Failed - Sensor not measuring
2
Start Zero Calibration
6b
Failed - Zero too high
2a
Set Coil 2000 (0x07D0)
MB-Telegram: 01 05 07 D0 FF 00 + CRC
6c
successful
3
Check Status Of Zero Calibration
7
Calibration Failure
3a
Read Coil 2000 (0x07D0)
MB-Telegram: 01 01 07 D0 00 01 + CRC
8
Read new Zero Flow Offset
4a
running
8a
Read Input Register 20001 (0x4E21)
MB-Telegram: 01 04 4E 21 00 02 + CRC
4b
ready
9
Write new Zero Flow Offset
5
5a
Read Result
Read Input Register 20000 (0x4E20)
MB-Telegram: 01 04 4E 20 00 01 + CRC
9a
Write Holding Register 46000 (0xB3B0)
MB-Telegram:
01 10 B3 B0 00 02 04 xx xx xx xx + CRC
10
Apply Changes
10a
Set Coil 1002 (0x03EA)
MB-Telegram: 01 05 03 EA FF 00 + CRC
11
Calibration Done