Allen-Bradley GuardLogix 5570

58 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 4 Communicate over Networks
Figure 10 shows a CIP safety system with seven different subnets where each
subnet has one unique SNN.
Figure 10 - CIP Safety Example with More Than One SNN
The SNN can be software-assigned (time-based) or user-assigned (manual).
These two formats of the SNN are described in the following sections.
Time-based Safety Network Number
If the time-based format is selected, the SNN value is the date and time when
the number was generated, according to the computer running the
configuration software.
Figure 11 - Time-based Format
Router/
Firewall
SNN_1 SNN_3 SNN_5
SNN_2 SNN_4 SNN_6
SNN_7
1756-L71S
1756-L7SP
1756-DNB
1756-EN2T
1768-PB3
1768-L43S
1769-ECR
Switch Switch
CIP Safety I/O
SmartGuard
1756-IB16
1756-DNB
1756-EN2T
1756-OB16
1768-ENBT 1768-ENBT
CIP Safety I/O
CIP Safety I/O
CIP Safety I/O
CIP Safety I/O
CIP Safety I/O
CIP Safety I/O
CIP Safety I/O