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5.2.37 DR 3 - Load cell type
Analog load cells (strain gauge full bridge sensor) as well as sensorsfrom
the Mettler Toledo type WM or WMH can be connected to the SIWAREX
FTC. This information defines which interface that the signal comes from:
-
via the connection with strain gauge analog load cells
-
via RS 485 with sensors type WM or WMH
After selecting the sensors METTLER TOLEDO Type WM or WMH,
settings must be made in data record DR 7 for the RS485 interface (see
4.4.10 )
In data record 3, the adjustment digits and adjustment weight must be
defined:
o Adjustment digits for zero point = 8388608
o Adjustment digits 1 = 13388608
o Adjustment digits 2, 3, 4 = 0
o Adjustment weight 1 = 5000000/ digital value per weight unit e.g. if
10000d/kg was sent from the sensor 5000000/10000=500
o Adjustment digits 2, 3, 4 = 0
The application-dependent sensor parameters are set using the tools for
defining parameters for the WM or WMH sensors.
The following settings (with instructions) must be made for communication
with SIWAREX FTC:
-
RS422 interface settings:
o PROT_2
o COM_1_8_0_0 (Interface RS422, 38400 baud, 7 Bits, even
-
Setting the digital inputs:
o DIN1_SIR_0_1 (Input 1 for the SIR instruction, positive edge,
o DIN1_SI_0_1 (Input 1 for the SIR instruction, positive edge,
5.2.38 DR 3 – Monitoring time for the digital load cells
The receipt of the cyclic weight telegrams from the load cell type types WM,
WMH is monitored. If no telegram is received for the defined time period (in
ms), SIWAREX FTC indicates an operational fault No. 24 – Digital load cell
not ready. A status bit also provides (Status NAWI, Bit 29) the information
on whether the digital load cell is ready. If the status bit is not set, the
5-46
SIWAREX FTC
(Basic protocol)
parity, 1 stop bit)
output via RS422)
output via RS422)
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