Performance; Power Up; Non-Volatile Memory; Reaction Delay - Endress+Hauser Modbus Liquistation CSF22 Manualline

Das vom Master adressierte Register ist nicht belegt (d.h. es existiert nicht), oder die Länge
der abgefragten Daten ist zu groß.
03 ILLEGAL_DATA_VALUE
Der Master versucht in ein Register zu schreiben, welches nur einen Lesezugriff erlaubt.
Der Wert, der in dem Datenfeld erscheint, ist nicht zulässig: z.B. Bereichsgrenzen
überschritten oder falsches Datenformat.
04 SLAVE_DEVICE_FAILURE
Der Slave hat auf das Anforderungstelegramm des Masters nicht geantwortet bzw. bei der
Verarbeitung des Anforderungstelegramms ist ein Fehler aufgetreten.
3.4.

Performance

3.4.1. Power up

On power up, the transmitter has to initialize itself, which takes up to 2 minutes. During this period, the device
will not respond to any Modbus communication.
As soon as the operation view appears on the display the Liquistation is ready to communicate via Modbus, no
matter if there are errors present or not.

3.4.2. Non-volatile memory

The device's configuration parameters are saved into a flash memory. It takes approximately 5 seconds after the
execution of the write command that the data will be saved. Data consistency is always ensured.

3.4.3. Reaction delay

The reaction delay is different depending on the direction of the data flow.
Modbus to Device
Received data is send without delay to the internal component processing this data. The internal components have
a fixed sampling rate of 3 Hz.
Device to Modbus
The reaction delay is defined as the time span between the moment a process value assumes a new value and this
value is replied to the Modbus client.

3.4.4. Modbus Response time

The device is limited to handle one Modbus transaction each 300 ms. Any first Modbus request is replied without
delay. The reply to a follow-up request is delayed for 300 ms after the last reply.
Endress+Hauser
© Copyright Dez. 2011
Liquistation CSF22 MODBUS
®
-Guideline
11