WAGO-I/O-SYSTEM 750
Process Image
27
750-493 3-Phase Power Measurement Module
Manual
Version 1.2.0
4.2
Simple Process Image
Each input data word in a simple process image is assigned to one channel and
can only read measured values from this channel.
Table 16: Simple Process Image
Controlbyte
Input Data Word
Channel 1
C0
Input data word 1
D1
D0
Channel 2
C1
Input data word 2
D3
D2
Channel 3
C2
Input data word 3
D5
D4
When entering a process data index into a control byte in the process data mode,
the process data is returned in the associated process data word.
The process data indices are listed below in section “Control and Status Bytes”.
The channel index has no significance in the simple process image.
The simple process image is the default (factory) setting.
1st Example:
Reading out the voltages (rms value) of phases L1, L2 and L3
Enter 0x01 (process data index = 1) into the control bytes C0, C1 and C2.
The voltage (rms value) of phase L1 is returned in process data word 1 (D0, D1),
the voltage (rms value) of phase L2 is returned in process data word 2 (D2, D3)
and the voltage (rms value) of phase L3 is returned in process data word 3 (D4,
D5).
2nd Example:
Reading out the voltage (rms value) of phase L1, the current (rms value) of
phase L2 and the active power of phase L3
Enter 0x01 (channel index = 0, process data index = 1) into control byte C0,
0x00 (channel index = 0, process data index = 0) into control byte C1 and
0x02 (channel index = 0, process data index = 2) into control byte C2.
The voltage (rms value) of phase L1 is returned in input data word 1 (D0, D1),
the current (rms value) of phase L2 is returned in input data word 2 (D2, D3) and
the active power of phase L3 is returned in input data word 3 (D4, D5).
