SSB overview
The SSB (Smart System Bus) is a sub-bus system based on CANopen. It is a CANopen master with limited functionality. CANopen slaves may be connected to this interface for reading or writing distributed I/Os. Parameterization SDOs (service data objects) can be sent to the slave via a start-up window.
Configuration
The SSB is configured via the TwinCAT System Manager (see TwinCAT config). The configuration is then loaded onto the BX controller via ADS.
Technical data
|
SSB |
Data |
|---|---|
|
Max. number of slaves |
8 |
|
Max. number of PDOs |
32 RxPODs / 32 TxPDOs |
|
Baud rate |
10 kbaud to 1 Mbaud |
|
Permitted slave addresses |
1 to 64 |
Sync telegram
The sync telegram is transferred depending on the PLC task time. If a task time of 20 ms is set, the sync telegram is also sent every 20 ms (asynchronous with the PLC run time). The sync telegram is only generated when a device requires it and is configured accordingly.
Sync telegrams are supported from firmware 1.12.
Guarding
Guarding is supported and is sent after a configurable interval.