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1.1 APPLICATION
The CE approved weigh amplifier and processor 348, with its 4 software controlled setpoints, is used as an
intelligent dosing interface en co-processor between the loadcells of an electronic scale and dosing computers
and controllers, like PLC’s, PC’s, custombuilt systems i.e.
Typical applications are recipe dosing with setpoints and filling and check weighers.
The 348 prevents for the need of complex, with high speed en large figures calculating software for controlling
setpoints en dosing, in external weight controlling computers.
Dosing, using the 348’s setpoints, may be operated practically direct from the recipes of the database of the
external computer.
1.2 IN- and OUTPUTS
De 348 is equipped with a low level loadcell signal input, and a sine wave alternating current supply for the
loadcells with 6 VAC, with sense return control. Up to 8 loadcells (with strain gauge measuring principle) from
one weighing machine may be connected.
The communication port is selectable as RS232 or Current Loop, with full duplex communication and a bus
option.
The 4 setpoint outputs equipped with (exchangeable) opto couplers and supported by extensive operating
software functions.
1.3 OPERATING FACILITIES
Commands are available for:
- continuous comparison of the 4 setpoint values with the actual (net) weight value
- setting the setpoint values with execution program
- course / fine dosing, preceded by automatic zero setting with no motion control
- hold for each setpoint at switching off
- automatic step to the next setpoint (course / fine dosing)
- setpoint comparison with proportional speed compensation during dosing
- set tare and delete tare
- set zero
- toggle from gross to net weight data transmission
- request for the on/off status and the weight value setting of the setpoints
- request for the gross and nett actual weight value with status
- request for the zero weight value, initiated at switching on the scale
- request for transmission of the weigh speed, increasing or decreasing
- request for the no motion level, alarms i.e.
1.4 COMMUNICATION MODE
The 348 may be set at continuous transmission, or, if more processors are used in a bus (up to 15 devices
via interface 848), each separate 348 may be setted at its own call number and will respond 1 time on a
received command.
Standardized port settings are available, preferably speed is 19k2 Baud. The output may be installed as a
RS232 or as Current Loop port. CL is advised at longer cable connections and in the bus mode.
Manual 348-2 V 3.1 Page 5 01-06-2007
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