nVent RAYCHEM DigiTrace TCONTROL-CONT-03 Anleitung Seite 51

INHALT
1 Einleitung ...................................................................................52
1.1 Vorwort .........................................................................................................52
1.2 Typografische Konventionen .......................................................................52
2 Protokollbeschreibung ................................................................53
2.1 Master-Slave-Prinzip ....................................................................................53
2.2 Übertragungsmodus (RTU) ..........................................................................53
2.3 Geräteadresse ..............................................................................................54
2.4 Zeitlicher Ablauf der Kommunikation .........................................................54
2.5 Aufbau der Datenblöcke ..............................................................................57
2.6 Funktionscodes ............................................................................................58
2.6.1 Lesen von n Worten ...........................................................................58
2.6.2 Schreiben eines Wortes .....................................................................59
2.6.3 Schreiben von n Worten .....................................................................60
2.7 Übertragungsformat (Integer-, Float- und Text-Werte) ...............................61
2.8 Checksumme (CRC16) .................................................................................63
2.9 Fehlerbehandlung .........................................................................................64
3 nVent RAYCHEM RS485-Schnittstelle .........................................65
3.1 Anschlussplan ..............................................................................................65
3.2 Konfiguration ................................................................................................66
4 Modbus-Adressen ......................................................................67
4.1 Prozessdaten ................................................................................................67
4.2 Sollwerte .......................................................................................................69
4.3 Reglerparameter ...........................................................................................69
4.4 Konfiguration ................................................................................................69
4.5 Kommandos .................................................................................................70
4.6 RAM-Speicher ...............................................................................................71
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