NORD Drivesystems BU0550 - Manual (Page 77)

3 AWL (Instruction List, IL)
BU 0550 GB-0813 77
3.5.10 Weighing function (FB_Weigh)
This module is used to determine the average torque during travel with a constant speed. From this value,
physical values e.g. the moved weight can be determined.
The FB is started via a positive flank on theEXECUTE input. With the flank, all inputs are adopted by the FB.
The FI moves with the speed which is set under SPEED. After the elapse of the time which is set under
STARTTIME the measurement is started. The duration of the measurement is defined under
MEASURETIME. The FI stops after the elapse of the measurement time. If the input REVERSE = 1, the
measurement restarts, however with a negated speed. Otherwise the measurement is complete; the output
DONE changes to 1 and the measurement result is in VALUE.
As long as the measurement process is running, BUSY is active.
The scaling of the measurement result VALUE is 1 = 0.01% of the rated torque of the motor.
Call-up of another Motion FB stops the measurement function and the output ABORT changes to 1.
All outputs of the FB are reset with a new positive flank on EXECUTE (Reset).
Table 103 FB_Weigh
NOTE
Only one instance of this FB is permissible in the PLC program!
VAR_INPUT VAR_OUTPUT
Input Explanation Type Output Explanation Type
EXECUTE Execute BOOL DONE Measurement ended BOOL
REVERSE Change of rotation direction BOOL BUSY Measurement running BOOL
STARTTIME Time until start of measure-
ment in ms
(<2000ms)
INT ABORT Measurement aborted BOOL
MEASURETIME Measurement time in ms
(60 to 2000ms)
INT ERROR the FB has an error BOOL
SPEED Measurement speed in %
(16#4000 corresponds to
100%) INT ERRORID Error code INT
VALUE Measurement result INT
ERRORID Explanation
0 No error
0x1000 FI not switched on
0x1101 Setpoint frequency not parameterised as a setpoint (P553)
0x1C00 STARTTIME value range exceeded
0x1C01 MEASURETIME value range exceeded
0x1602 The tolerance of the measurement values with respect to each other is greater than 1/8