Building-Up The Measured Values - WAGO 750-494 Series Manual

54 Process Image
The status query was also set in the examples given here. In example 1, the status
query is made for the I/O module. The status word (Byte 0) is at 0x48, an error
occurred at the I/O module (ERROR, ERR_BK). Byte 2 is at 0x40, i.e., the rotary
field is not correct, counter-clockwise.
In example 2, the status query is made for phase L1. The status word (Byte 0) is at
0x41, an error has occurred at phase L1 (ERROR, ERR_L1). Byte 2 is at 0x08,
i.e., the voltage signal at phase L1 is outside the valid range for the I/O module
and has been clipped. In addition, byte 1 is at 0x80. This means that the measured
values of the collection are not yet stable. The transient reaction period (build-up)
must end, then the measured values are stable.
5.4.1

Building-up the Measured Values

Build-up times must be taken into account when switching measured value
collections in order to obtain stable measured values in the process image. You
can check whether the measured values are stable by the "WARN" flag in the
status word (Byte 1). The build-up times are given in the next section "Process
Image" > "Collections of Measured Values".
WAGO-I/O-SYSTEM 750
750-494 3-Phase Power Measurement Module
Manual
Version 1.2.0