Flintec MCS-64 ModbusOnEthernet - Manual (Page 26)

Page 26 Manual MSC-64: Modbus on Ethernet
5.7 Setpoint Commands - Sn, Hn, An
The LDM88.x has 4 setpoints where the status depends on the weight value. Each of them can
be assigned as an independent setpoint value (Sn) with a corresponding hysteresis/switch action
(Hn) and base (An – switch on the gross or the net weight).
Sn Setpoint n; with n = 1, 2, 3 or 4
Select setpoint 1…4 [ Register = 2067, Type = Int16, Value = 0…3 ]
Value of the selected setpoint [ Register = 206C, Type = Int32 ]
Request / Setting
Master (PC / PLC) sends Device responds Result
S1 1+01500 Setpoint S1 = 1500 d
S1_03000 OK Setting: Setpoint S1 = 3000 d
Setpoint range between ± 1 (minimum) and ± 199999 (maximum).
Similarly to read or set setpoint 2, use S2 instead of S1, etc.
Hn Hysteresis of setpoint n; with n = 1, 2, 3 or 4
Hysteresis of the selected setpoint [ Register = 206A, Type = Int32 ]
Request / Set Hysteresis value for setpoint 1
Master (PC / PLC) sends Device responds Result
H1 1-00100 Request: neg. Hysteresis
H1_100 OK Setting: pos. Hysteresis
H1_-100 OK Setting: neg. Hysteresis
Similarly to read or set the setpoint 1 hysteresis, use H2 instead of H1 etc.
Using the H1 command, the hysteresis on the setpoint value is set by the numeric value and the
polarity of this numeric value defines whether the setpoint switches on or off when the setpoint
value is reached.
Example
Setpoint Hysteresis Load OFF ON
S1 = 20.00 kg H1 = -1.00 kg increasing
≥ 21.01 kg
0 ... 21.00 kg
S1 = 20.00 kg H1 = -1.00 kg decreasing
≥ 20.00 kg
19.99 ... 0 kg
S1 = 20.00 kg H1 = 1.00 kg increasing 0... 19.99 kg
≥ 20.00 kg
S1 = 20.00 kg H1 = 1.00 kg decreasing 19.00. ..0 kg ≥ 19.01 kg
Example of negative hysteresis of 1.00 kg (H1 = -100) on a setpoint (S1) of 20.00 kg (lines 1 & 2
of table above):
When the weight is increasing between 0 kg and 21.00 kg the setpoint is “ON”. Once the weight
increases above 21.00 kg then the logic output is “OFF”. The setpoint will come “ON” again when
the weight value drops below 20.00 kg.