HIEE410409P104控制卡件,处理器卡件
RX3i模拟HART模块不支持多点通信（即信道上的多个现场设备），也不支持突发模式传输。RX3i HART模块自动向配置中存在并启用的任何HART设备发出HART命令。这些命令的响应数据保存在RX3i HART模块的内部存储器中，并通过HART数据的输入扫描或通过获取设备信息COMMREQ（命令1）提供给RX3i控制器。RX3i HART模块可配置为通过使用HART数据扫描控制通过输入扫描使HART设备数据可用于RX3i控制器。使用此选项，来自每个设备的自动HART命令响应数据被格式化并写入HART数据参考地址处的RX3i参考存储器。这发生在正常RX3i输入扫描期间。此选项可能已禁用。可配置两种自动数据显示模式：“所有数据”和“动态数据”。·Dynamic Only定期执行HART命令#3，并将生成的PV、SV、TV和FV变量提供给RX3i输入参考存储器。如果启用HART槽变量，HART命令#33槽变量值也会自动更新。仅动态数据还包括最新的通信和设备状态。·所有数据选项提供与仅动态选项相同的信息，以及来自HART命令0、12、13、15、16、48和50的附加数据。在启动期间或设备配置发生变化后（如设置的HART设备上的“配置变化”位所示），RX3i HART模块执行HART命令0、3、12、13、15、16、33、48和50（所有数据模式）。此外，如果启用HART槽变量（动态数据模式），模块会定期重新发出命令#3和#33。发出动态数据命令的重复周期取决于HART直通服务选项的配置以及调制解调器组中启用的HART设备的数量。每次HART设备初始化时，都会发出第59号HART命令：它将前导码的数量设置为5。在许多应用中，仅动态选项应提供所有所需的HART变量。变量数据在HART模块的输入扫描数据中自动更新（无需COMMREQ触发器）。如果仅动态数据不足，可使用所有数据选项自动访问其他HART数据。启用“仅动态”或“所有数据”选项会影响PLC I/O扫描时间，因为来自模块的输入扫描数据增加。PACSystems*RX3i系统手册第12节GFK-2314T 2019年9月带HART通信的模拟模块493如果两个扫描选项都没有提供所有必要的输入，或者如果需要对HART设备进行额外控制，则可以使用COMMREQ来提供额外功能或替代自动输入扫描。有三个COMMREQ可用。·获取设备信息COMMREQ（命令1）为HART设备返回与所有数据扫描选项相同的数据；然而，此COMMREQ必须在逻辑中重新发出，以获得变量数据的更新。·HART直通COMMREQ能够执行任何HART命令，包括制造商特定命令；但是，必须小心地正确格式化HART命令请求和响应数据，这些数据必须是字节压缩的，并且“大端”格式。本章给出了说明。·远程获取设备信息COMMREQ为HART设备返回与所有数据扫描选项相同的数据；然而，此COMMREQ必须在逻辑中重新发出，以获得变量数据的更新。11.1.2将DO I/O与HART模块一起使用HART模块完全支持DOIO功能块，前提是仅扫描模拟信道值和模拟诊断。然而，当HART设备处于
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
