Leuze electronic
BCL 558
i
139
TNT
35/7-2
4
V
Below, examples of what data exchange looks like during two subsequent activations are
shown.
Figure 10.8: Data exchange sequence diagram - example 1
Allen-Bradley
:PLC
BCL 558i
:DEV
Output-Assembly
Input-Assembly
Barcode "TestLabel01"
Input-Assembly
Output-Assembly
Output-Assembly
Input-Assembly
Barcode "TestLabel01"
Input-Assembly
Output-Assembly
1st activation
Activation status
= 0
User data / command
= 0
New result (toggle bit)
= 1
Result data length
= 11
Data
= "TestLabel01"
Activation signal
= 1
Activation signal via
PLC
Activation status
changes
Bar code is read
Result is transmitted to
the PLC
Deactivation signal via
PLC
2nd activation
Activation signal via
PLC
Activation status
changes
Bar code is read
Result is transmitted to
the PLC
Deactivation signal via
PLC
Activation status
= 1
Activation signal
= 0
Activation status
= 0
User data / command
= 0
New result (toggle bit)
= 0
Result data length
= 11
Data
= "TestLabel01"
Activation signal
= 1
Activation status
= 1
Activation signal
= 0