The CGM, CGE, CVM, CVE, FAC, and VMA1930 equipment controllers feature an integral real-time clock which enables these equipment controllers to monitor and control schedules, calendars, alarms, and trends. The local equipment controller trend, alarm, and event setup strategy should focus on needs during a stand-alone commissioning session using CCT. The integration of an equipment controller's trends, alarms, and events is governed by the network engine guidelines for trend and alarm/event integrations.
The recommended limit threshold for trend samples for a network engine is 1,500 samples per hour. The total number of trend samples forwarded from all equipment controllers integrated with a network engine should not exceed this limit during the setup of the local equipment controller trends.
The recommended limit threshold for alarm and event samples for a network engine is 100 events per hour. The alarms that are set up in an equipment controller for use as BACnet Alarm extensions in the network engine should be limited to only the points that normally are created as extensions in the network engines. For consistency, the use of BACnet Alarm extensions instead of Metasys Alarm extensions should also be considered when deciding whether the equipment controller's BACnet Alarms should be enabled at the network.
- 5 equipment controllers (CGM, CGE, CVM, CVE, FAC, or VMA1930) with 6 alarms per hour plus 1 network engine with 30 alarms per hour (Table 1)
- 5 equipment controllers (CGM, CGE, CVM, CVE, FAC, or VMA1930) with 200 trend samples per hour plus 1 network engine with 500 trend samples per hour (Table 2)
- 5 equipment controllers (CGM, CGE, CVM, CVE, FAC, or VMA1930) with 10 COVs per minute plus 35 FECs with 10 COVs per minute (Table 3)
| Setup | Alarms per hour |
|---|---|
| 5 equipment controllers with 6 alarms/hour each | 30 alarms per hour |
| 1 network engine | 30 alarms per hour |
| Total | 60 alarms per hour |
| Setup | Trend samples per hour |
|---|---|
| 5 equipment controllers with 200 trend samples per hour each | 1,000 trend samples per hour |
| 1 network engine | 500 trend sample per hour |
| Total | 1,500 trend samples per hour |
| Setup | COVs per minute |
|---|---|
| 5 CGMs, CGEs, CVMs, CVEs, FACs, or VMA1930s with 10 COVs/minute | 50 COVs per minute |
| 35 FECs with 10 COVs/minute | 350 COVs per minute |
| Total | 400 COVs per minute |
For trend creations in the CGM, CGE, CVM, CVE, FAC, and VMA1930, the use of faster sample intervals of key points provides a more intuitive troubleshooting interface in a CCT commissioning session via the CCT's trend viewer. Setting up the trends for local use in CCT does not mean that the same points and sample intervals have to be utilized in the network engine integration. The trends created in an equipment controller do not have to be discovered and used by the network engines; separate trends extensions can still be added at the network engine for any points that have equipment controller-based trends created.