Pi interface for Bailey Infi90
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- Introduction 4 Failover
- Vendor Hardware Required
- Serial-Based Interface
| Exception Reporting The Bailey Net or Infi90 control system performs exception reporting. This Interface receives exception values and sends them to the PI Server. Source of Timestamps The clock on the computer running the PI Server provides timestamps for the BaInfi90 interface. For input points, the Interface writes a timestamp that reflects the time at which it received the exception values from the CIU. For output points, the Interface writes a timestamp that reflects the time of the event that triggered the output. Introduction 4 Failover Failover is implemented by running two copies of the BaInfi90 Interface in a failover configuration. One copy is designated as the Primary and the other as the Secondary. The failover mechanism uses a watchdog signal on the Bailey control system to determine when the Secondary interface should assume data collection because of a failure in the Primary. Vendor Hardware Required The interface connects to either the CIU01 version or the enhanced versions (CIU02, CIU03, CIU04) of the Bailey Net computer interface module. The interface also connects to the serial version of the Infi90 ICI01. Device Point Types The BaInfi90 interface supports the following Net90/Infi90 point types Point Type Description 1 Process Variable 2 Setpoint Read 3 Control Output Read 4 Ratio Index Read 5 Analog Read 6 Station Status 7 Digital Read 12 Analog Report 13 Digital Report 14 Module Status 15 RCM Read 19 RMSC Read 21 byte Analog Read (CIU04 only) 22 byte Analog Report (CIU04 only) Serial-Based Interface This interface uses a serial connection to the Bailey Infi90 network. Recent Dell server class machines are using only 3 volt power supplies to drive the serial port – IEEE RS specification requires at least +/- 4.7 volts fora valid RS signal. Some recent models of HP and Dell server class machines have been observed to have serial port circuitry which overheat and experience thermal shutdown after a few minutes or hours of operation overlong cables or high speeds. Self-powered serial port extenders should not be used for interfaces. Customers often attempt to extend serial port ranges using twisted pair wire devices or fiber optic cable devices. Devices with their own external power source (for example, a wall wart transformer) should be the only types used. Devices which leech power from the PC’s serial port will have difficulty at high data speeds (baud rates) or long cables. In some applications, a cable more than 20-50 feet long maybe considered long. Higher speeds or longer cables translate to sharply increased power supply demand by the serial port hardware. |