MTL measures 8502-BI-DP Bus interface modules
GE MTL measures 8502-BI-DP Bus interface modules
Profibus protocol
◆ links MTL8000 node to Profibus-DP host LAN
◆ supports up to 24 I/O modules
◆ HART process & status variables over Profibus-DP
◆ extended diagnostics for module and channel status
◆ LAN speeds of up to 6 Mbaud
◆ non-volatile memory for configuration
◆ software configurable via local port or Profibus host
◆ HART® maintenance via Comms adaptor
The 8502-BI-DP Bus Interface Module (BIM) provides the communications link between the 8000 series I/O modules and a Profibus-DP host. Its high speed acquisition of data from the modules and LAN operation speeds of up to 6 Mbaud allows the host to respond rapidly to conditions in the control process. The BIM gathers the data from the I/O modules and makes it available to the host upon request. It is a slave to the Profibus master. As well as cyclic data exchange, which is required for reading input and writing output data, the BIM supports Profibus Extended Diagnostics for status information. It also supports a number of special features which have been implemented to allow high integrity system operation and in-situ maintenance.
PARAMETERISATION
The 8502 supports parameterisation from the Profibus master. This configures on a “per module” basis, i.e. all the channels on a single module carry the same configuration. The configuration is created in a Profibus configurator using details provided in a GSD file. This method is fast and enables a configuration to be built based upon “logical” modules which represent the physical modules. Modules are added one at a time to the configuration and parameters are chosen to apply to all the channels of the module. Logical modules can be selected to provide HART status and process variables in the Profibus-DP cyclic input telegram. In addition, for applications where access to many HART variables is required, the HART “mailbox” can be used. This technique collects HART variable as they are required; saving space in telegrams that are sometimes overworked with data. This method is available only when using parameterisation. The configuration is passed down from the Profibus master to the BIM at the start of the session. If the system is stopped and re-started, the configuration file is re-transmitted to the BIM.
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