HIEE410409P104控制卡件,處理器卡件
RX3i模擬HART模塊不支持多點通信（即信道上的多個現場設備），也不支持突發模式傳輸。RX3i HART模塊自動向配置中存在并啟用的任何HART設備發出HART命令。這些命令的響應數據保存在RX3i HART模塊的內部存儲器中，并通過HART數據的輸入掃描或通過獲取設備信息COMMREQ（命令1）提供給RX3i控制器。RX3i HART模塊可配置為通過使用HART數據掃描控制通過輸入掃描使HART設備數據可用于RX3i控制器。使用此選項，來自每個設備的自動HART命令響應數據被格式化并寫入HART數據參考地址處的RX3i參考存儲器。這發生在正常RX3i輸入掃描期間。此選項可能已禁用。可配置兩種自動數據顯示模式：“所有數據”和“動態數據”。·Dynamic Only定期執行HART命令#3，并將生成的PV、SV、TV和FV變量提供給RX3i輸入參考存儲器。如果啟用HART槽變量，HART命令#33槽變量值也會自動更新。僅動態數據還包括最新的通信和設備狀態。·所有數據選項提供與僅動態選項相同的信息，以及來自HART命令0、12、13、15、16、48和50的附加數據。在啟動期間或設備配置發生變化后（如設置的HART設備上的“配置變化”位所示），RX3i HART模塊執行HART命令0、3、12、13、15、16、33、48和50（所有數據模式）。此外，如果啟用HART槽變量（動態數據模式），模塊會定期重新發出命令#3和#33。發出動態數據命令的重復周期取決于HART直通服務選項的配置以及調制解調器組中啟用的HART設備的數量。每次HART設備初始化時，都會發出第59號HART命令：它將前導碼的數量設置為5。在許多應用中，僅動態選項應提供所有所需的HART變量。變量數據在HART模塊的輸入掃描數據中自動更新（無需COMMREQ觸發器）。如果僅動態數據不足，可使用所有數據選項自動訪問其他HART數據。啟用“僅動態”或“所有數據”選項會影響PLC I/O掃描時間，因為來自模塊的輸入掃描數據增加。PACSystems*RX3i系統手冊第12節GFK-2314T 2019年9月帶HART通信的模擬模塊493如果兩個掃描選項都沒有提供所有必要的輸入，或者如果需要對HART設備進行額外控制，則可以使用COMMREQ來提供額外功能或替代自動輸入掃描。有三個COMMREQ可用。·獲取設備信息COMMREQ（命令1）為HART設備返回與所有數據掃描選項相同的數據；然而，此COMMREQ必須在邏輯中重新發出，以獲得變量數據的更新。·HART直通COMMREQ能夠執行任何HART命令，包括制造商特定命令；但是，必須小心地正確格式化HART命令請求和響應數據，這些數據必須是字節壓縮的，并且“大端”格式。本章給出了說明。·遠程獲取設備信息COMMREQ為HART設備返回與所有數據掃描選項相同的數據；然而，此COMMREQ必須在邏輯中重新發出，以獲得變量數據的更新。11.1.2將DO I/O與HART模塊一起使用HART模塊完全支持DOIO功能塊，前提是僅掃描模擬信道值和模擬診斷。然而，當HART設備處于
The RX3i Analog HART module does not support multi-drop communications (i.e. multiple field devices on a channel), nor does it support Burst Mode transmissions. The RX3i HART module automatically issues HART commands to any HART device that is present and enabled in configuration. The response data from these commands is maintained within the internal memory of the RX3i HART module and is made available to the RX3i Controller via input scanning of HART Data, or via the Get Device Information COMMREQ (command 1). An RX3i HART module can be configured to make HART device data available to the RX3i controller via input scanning by using the HART Data Scan Control. With this option, the automatic HART command response data from each device is formatted and written to RX3i reference memory at the HART Data Reference Address. This occurs during the normal RX3i input scan. This option may be disabled. Two modes of automatic data presentation are configurable: “All Data” and “Dynamic Data”. · Dynamic Only periodically executes HART command #3 and provides the resulting PV, SV, TV, and FV variables to the RX3i input reference memory. If HART Slot Variables are enabled, HART command #33 slot variable values are also updated automatically. Dynamic Only data also includes the most current Communication and Device Status. · All Data option provides the same information as the Dynamic Only option, plus additional data from HART commands 0, 12, 13, 15, 16, 48, and 50. During start-up, or after a device configuration changes (as indicated by the "configuration changed" bit on the HART device being set), the RX3i HART module executes HART commands 0, 3, 12, 13, 15, 16, 33, 48, and 50 (All Data mode). In addition, if HART Slot Variables are enabled (Dynamic Data mode), the module periodically re-issues commands #3 and #33. The repetition period at which the Dynamic Data commands are issued depends on the configuration for HART Pass-Through Service Options and on the number of HART devices enabled in a modem group. HART command #59 is issued each time a HART device initializes: it sets the number of preambles to 5. In many applications, the Dynamic Only option should provide all of the needed HART variables. The variable data updates automatically in the input scan data of the HART module (no COMMREQ trigger is needed). If the Dynamic Only data is not sufficient, additional HART data may be accessed automatically using the All Data option. Enabling either the Dynamic Only or All Data option affects the PLC I/O sweep time because of increased input scan data from the module. PACSystems* RX3i System Manual Section 12 GFK-2314T Sept. 2019 Analog Modules with HART Communications 493 If neither scan option provides all the necessary inputs, or if additional control of HART devices is needed, COMMREQs are available that provide additional functionality or replace the automatic input scanning. Three COMMREQs are available. · The Get Device Information COMMREQ (Command 1) returns the same data for a HART device as the All Data scan option; however, this COMMREQ must be reissued in logic to get updates of the variable data. · The HART Pass-Through COMMREQ is capable of executing any HART command including manufacturer-specific commands; however, care must be used to correctly format HART command request and response data, which must be byte-packed and “big-endian” formatted. Instructions are given in this chapter. · The Remote Get Device Information COMMREQ returns the same data for a HART device as the All Data scan option; however, this COMMREQ must be reissued in logic to get updates of the variable data. 11.1.2 Using DO I/O with HART Modules The HART modules fully support the DOIO function block provided only analog channel values and analog diagnostics are to be scanned. However, DOIO will not function under certain conditions when HART devices are
