KROHNE H250 M8-M9-M10 EN - Manual (Page 36)

4
ELECTRICAL CONNECTIONS
36
H250
www.krohne.com 04/2011 - 4000269302 MA H250-R02 en
HART ® communication
When HART ® communication is carried out with the M10, this will not in any way impair analogue
measured data transmission (4...20 mA).
Exception for multidrop operation. In multidrop operation, a maximum of 15 devices with HART
®
function can be operated in parallel, for which the current outputs are switched to inactive.
Load for HART ® communication
The maximum load resistance is calculated as follows:
Configuration
The M10 electronic indicator can be configured via HART ® communication. DD (Device
Descriptions) for AMS 6.x and PDM 5.2 as well as a DTM (Device Type Manager) are available for
configuration. They can be downloaded free of charge from our website.
The current flow rate can be transmitted using the integrated HART ® communication. The flow
counter can be configured. Two limit values can be monitored. The limit values are assigned
either to flow values or to the counter.
INFORMATION!
For HART
® communication a load of at least 230 ohm is required.
DANGER!
Use a twisted two-core cable to prevent electrical interference from impeding the DC output
signal.
In some cases a shielded cable may be necessary. The cable shield may only be earthed
(grounded) at one place (on the power supply unit).
MA_H250_R02_en_269302_PRT.book Page 36 Tuesday, April 12, 2011 10:17 AM