KROHNE Summit 8800 Vol 3 - Manual (Page 128)

128 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 COMMUNICATION 08
The settings needed are:
Inter-packet delay In a noisy environment characters may be lost causing two packets frames
to be mixed. This is prevented by putting a delay at the end of each packet. Not needed for TCP/
IP.
Timeout Time to stop connectivity attempts between the devices
Retries Number of attempts to establish communication before an alarm is given
Read delay As the device has to process the read command, it might be needed a delay before the
actual data arrive.
Modbus ID Unique identifier for the Modbus device
In the stream flow computers, the Modbus slave is defined in a file with the same name as the
master, which can be imported as a modbus list.
8 .3 .6 Gas chromatographs
For gas measurement a gas chromatograph or GC is often needed. Several popular GC’s can be
selected:
Emerson Daniel 2251
Daniel 2350
Daniel 2551
Yamatake HGC303
ABB ABB 8000
ABB 8000S
ABB 8200
Siemens Maxum II
Instromet Encal 3000
Contact KROHNE as your GC may already be available or may be created for you. Other GC’s can
be created using the custom Modbus master.
All chromatographs have very similar settings consisting of device and component settings. The
device settings are: