Beckhoff EL3773, Documentation

Page: 87 / 179

Commissioning
EL3773 87 Version: 2.5
Data processing
The data processing is done simultaneously for all channels in the EL3773 with 16-bit conversion in the ADC
Scaling related to the respective (constant) measuring range:
1. Vendor calibration ( 0x80p0:0B [
}
95] )
Activation: CoE 0x80p0:0B
X
1
= (X
ADC
- Offset
Vendor
) * Gain
Vendor
This produces the following signed integer value representation:
Input signal Value
Voltage Current Decimal Hexadecimal
410 V 1.5 A 32767 0x7FFF
205 V 0.75 A 16383 0x3FFF
0 V 0 A 0 0x0000
-205 V -0.75 A -16383 0xC001
-410 V -1.5 A -32767 0x8000
Signed integer: the negative output value is represented in two’s complement (n 1). Maximum
representation range for 16 bits = -32768 to +32767
dec
.
2. User calibration ( 0x80p0:0A [
}
95] )
Activation: CoE 0x80n0:0A
X
2
= (X
1
- Offset
User
) * Gain
User
3. Limit value evaluation ( 0x80p0:13 [
}
95] , 0x80p0:14 [
}
95] )
Display in the status word [
}
91] of the channel
If the value exceeds or falls below these values, which can be entered in the indices 0x80p0:13 [
}
95] and
0x80p0:14 [
}
95] , then the bits in the indices 0x60p0:03 [
}
96] and 0x60p0:05 [
}
96] are set accordingly
(see example [ } 87] below).
The entry 0x80p0:07 [ } 95] serves to activate the limit value monitoring.
Output limit n (2-bit):
• 0: not active
• 1: One or more values <= Limit n
• 2: One or more values >= Limit n
• 3: Cases 1 and 2 simultaneously
Note
Linking in the PLC with 2-bit values
The limit information consists of 2 bits. Limitn can be linked to the PLC or a task in the Sys-
tem Manager:
• PLC:
IEC61131-PLC contains no 2-bit data type that can be linked with this process data di-
rectly. In order to transmit the limit information, therefore, define an input byte, e.g.
and link the limit with the VariableSizeMismatch dialog.
• Additional task
2-bit variables can be created in the System Manager.