7.6.1.1
Position Cross Check function block
Figure 41: Function block view - Position Cross Check SAPP-FB
This function block compares position values from two different signal sources and
checks that the difference between the position values falls within the tolerance zone.
Table 56: Function of the inputs
Input name
Function
Sensor 1
BG100.1 OLM sensor 1 (at MOC1 input ENC1)
Sensor 2
BG100.2 OLM sensor 2 (at MOC1 input ENC2)
Inhibit_Error_ Message
This signal comes from the CPU logic and is set to High when a
permissible error occurs with the position data. The position data
is invalid when the sensor 2 test is active. The
Inhibit_Error_Message
signal stops an entry being made in the diagnostics file in this
case.
Table 57: Function of the outputs
Output name
Function
Motion data cross checked
(Motion data type):
The
Motion
data type adds additional diagnostics information to all
information provided by the motion sensors. If the diagnostics
information relates to both motion sensors, the motion data
becomes invalid as soon as there is a fault with one of the two
sensors.
Status
This output indicates whether or not the position cross-check was
successful (0 = not successful / 1 = successful). The signal is for‐
warded to the CPU logic.
AbsPosReliability
This output indicates whether or not the data from both sensors is
valid and reliable (0 = invalid / 1 = valid). The signal is forwarded
to the CPU logic.
7.6.1.2
Inhibiting the Diagnostics function block during internal tests
Figure 42: Function block view - Inhibit_Error_Message signal
CONFIGURATION
7
8020941/12O9/2019-08-05 | SICK
O P E R A T I N G I N S T R U C T I O N S | Safe Linear Positioning
65
Subject to change without notice
