CMSI STT Fire Systems
This section provides background information about the integration of STT20 and STT11 fire panels into Desigo CC. For related procedures, see the step-by-step section.
STT20 panels are networked together with an FS20 fire detection system on an FCnet/SAFEDLINK network. One of the fire actuation units acts as a Global Access Point (GAP) and handles the BACnet communication to Desigo CC.
NOTE:
Each networked STT20 panel must be equipped with an FCGW20-2 gateway.
STT20 on FCnet - System Limits and Compatibility
System limits:
- 10 STT20 and 12 fire detection panels per SAFEDLINK fire network.
Compatibility information:
- STT20 panel version: 5.21.xx and newer.
- FCGW20-2 gateway version: 2.20-02 and newer.
Both STT20 and STT11 can also connect to Desigo CC over a Cerloop Network via MK7022/NK823x.
STT20 on Cerloop - System Limits and Compatibility
System limits:
- 40 fire panels per Cerloop, including all types.
Compatibility information:
- STT20 panel version: 2.xx.
STT11 on Cerloop - System Limits and Compatibility
System limits:
- 40 fire panels per Cerloop, including all types.
Fire applications communication is based on the BACnet standard protocol.
BACnet is a building automation and control networking protocol designed to meet the communication needs of building automation and control systems, as well as safety applications.
Desigo CC uses BACnet in combination with IP networks (Ethernet). This solution is called BACnet/IP although it is referred to as BACnet in this documentation.
BACnet Network
On IP infrastructures applying UDP services, a BACnet network (BACnet/IP) consists of one or more IP subnets. All networked units are BACnet devices and must have a unique Device Identifier. The Desigo CC server or FEP (represented by the BACnet driver) are also BACnet devices.
BACnet Addressing
The BACnet addressing is based on the instance number, the BACnet Device identifier (a value between 0 and 4194303). The instance number configured in Desigo CC for BACnet panels must match the BACnet Device ID configured in the engineering tool of the panels.
BACnet Interfaces
When a BACnet interface (for example, the NK823x Ethernet Port) is used to integrate non-BACnet panels, both the interface and the connected panels have assigned a unique instance number at Desigo CC level.
BACnet Stack Protocol Service
The BACnet Stack Protocol Service (BACstack) is the driver that handles the network communication. The BACstack service handles a physical port for every physical driver.
This section contains STT20 and STT11 troubleshooting information.
STT20 Import Errors
Message | Situation | Do the following... |
The specified file is invalid. | The selected file to import is not a valid configuration file or it is not suitable to the Desigo CC sales channel. | Retry using a new file. Check that the file is generated by a tool belonging to the same Desigo CC sales channel. |
There are warnings or errors, look at the log file. | The selected file to import is valid, but some data is not supported. | Open the analysis log (Analysis Log button) to check the pre-import log. |
| Based on the hardware category of the installation, there is a limit to the number of objects a project can have. The system prevents you from performing imports that would exceed this limit. The system warns you if an import would approach this limit (90% or more of allowed objects). You can then choose whether to proceed. | If the installation allows for it, you can change the hardware category in the server properties to increase the system objects limit. |
