NORD Drivesystems BU0550 - Manual (Page 19)

3 AWL (Instruction List, IL)
BU 0550 GB-0813 19
2.7 Program example
1. Comment to program function and the outline conditions for the program
e.g parameterise inverter for PLC control (the parameterisation must be carried out in the inverter.):
Parameter P350 = 1 Control of the FI via PLC
Parameter P351 = 0 Control work and main setpoint from the PLC
Parameter P553[-01] = 1 The PLC setpoint 1 is defined as the setpoint frequency
2. Definition of the variables and process values used in the PLC
_5_State_digital_input Status of the digital inputs
_7_Analog_input1 Value of analog input 1
_21_PLC_set_val1 PLC – setpoint 1
Run Instance of the Motion Control module "MC_Power" (name freely selectable)
3. Program sequence
Command Meaning Example
LD _5_State_digital_input .0 Reads the status of the digital inputs and loads the
value of digital input 1 into the accumulator
Digital input 1: high  Accumula-
tor = 1
ST Run .Enable Saves the value from the accumulator in the Mo-
tion Control block called up by the variable Run as
the value for Enable .
Enable = 1
LD _7_Analog_input1 Reads the value of analog input 1 (Standardisation:
10 V = 1000) and loads it into the accumulator
AIn1 = 2.5 V  accumulator = 250
SUB int#500 Subtracts the integer value 500 from the accumu-
lator (shifts the 0-point from 0 to 5 V)
250 - 500 = Accumulator = - 250
MUL int#32 Multiplies the integer value 32 with the accumula-
tor value ( Standardisation of the setpoint to the
value range of the FI (100 % = 4000
hex
≈
16000
dec
).
-250 * 32 = Accumulator = - 8000
dec
ST _21_PLC_set_val1 Saves the accumulator in the process variable
PLC-setpoint1 .
-8000
dec
 setpoint - 50 %
(Setpoint 50 % of the maximum
frequency in the direction of rota-
tion to the left)
Cal Run The Motion Control function module for setting the
output stage of the inverter is executed
Output stage is enabled.