Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019 14
Safety Bus Protocol Technical Specifications Introduction
2.6 Safety Bus Protocol Technical Specifications
• Ring-type network
• Up to 66 nodes on a single ring (64 modules + 2 control boards)
• Bit rate: 125KHz
• Max length of a copper segment: 20 ft (6.096 m) *
• Supports a single failure on the communication ring (open or short circuit)
* Refer to Section 4.2 for length.
2.6.1 Ring Operation in Failure Condition
With no communication ring failures, messages are transmitted continually as shown in the follow-
ing image:
If there is a single communication ring failure, the messages are sent by the control boards in both
directions, as shown in the image below, guaranteeing correct operation of the entire system.
If there are multiple communication ring failures, the devices isolated from the panel (circled in
red) continue to operate but are not able to communicate with the panel. The other modules com-
municate using two separate paths.
Figure 2.4 Communication with No Failures Along the Ring
Figure 2.5 Communication with a Failure Along the Ring
Figure 2.6 Communication with Multiple Failures Along the Ring
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