HardwareΒΆ
The Communication Interface Module CI590-CS31-HA: CI590-CS31-HA
Two AC500 CPUs are required as central hardware components. Each CPU must be equipped with an integrated ETHERNET port (or ETHERNET Communication Module) and a connection for a CS31 master system. These two CPUs, called station A and station B, are linked by means of an ETHERNET bus system through which they can exchange information. Connection to the peripheral devices is performed via two CS31 master systems - one on station A and another on station B.
AC500 I/O devices on CI590-CS31-HA are connected to both CS31 master systems. The CS31 slave interface enables switching from the first to the second interface in the event of a fault, thereby enabling process status data to be passed to the peripherals by the second CS31 master.
Until version V2.3.0 (HA_CS31_AC500_V23.lib) the library supported high availability only for I/O modules connected on CPU COM1 of the CS31 Bus.
Only one PLC COM CS31 Bus
The following diagram represents HA-CS31 system recommendation for applications using one CPU COM CS31 Bus only.
Note
Blocks inside the doted box are not mandatory. However, if users require ETHERNET redundancy with a control system/SCADA/ DigiVis 500, the customer has to use Level 2 Managed ETHERNET switch.
PLC COM CS31 Bus and CM574-RS COM CS31 Bus
As of HA-CS31 library version V2.4.0 (HA_CS31_AC500_V23.lib) and higher, high availability also supports the I/O modules connected on both CPU COM ports and CM574-RS COM ports.
The HA-CS31 library supports up to three CM574-RS modules and each CM574-RS supports two CS31 lines. So it supports a maximum of seven CS31 lines including CPU COM1 CS31 line.
Note
PM595 supports maximum 2 CM574-RS modules. So it supports a maximum of 5 CS31 lines including CPU COM1 CS31 line.
Note
PM591-2 ETH and PM595 PLCs must use onboard ETH1 for UDP data communication.
The following diagram represents one CPU COM CS31 Bus and only one CM574-RS COM CS31 Bus. Users can add up to three CM574-RS as per the requirements:
Recommended high availability connection. Option 2.
Note
Blocks inside the doted box are not mandatory. However, if the application requires ETHERNET redundancy with DigiVis 500, the user has to use Level 2 Managed ETHERNET switch.