1769-L33ER模块备件

1769-L33ER

祝贺您安装新的Senva EM-RS485电能表！本BACnet协议指南假设：
安装的一阶段已完成，仪表和任何CVT已连接并通电。果岭
设备状态指示仪表已通电并准备就绪。如果没有，请参阅单独的安装说明
在继续之前。现在，只有网络配置保留在您和数据之间。
将仪表保持在默认出厂模式，以进行自动网络配置：
•自动波特率检测（见BV114，AV124）：9600–115200波特
•自动协议检测（见BV112，MSV122）：BACnet
•自动MAC地址选择（见BV113，AV123）：0-127
要开始自动配置，只需将RS485终端连接到激活的MS/TP网络。一
主动MS/TP网络由至少一个MS/TP主设备（通常是网关或控制器）组成。
一旦连接，仪表会观察RS485活动，以了解波特率、协议和MAC地址。没有
活动，仪表无法学习！在测试期间，电表不会干扰现有的网络流量
观察阶段。随着配置的进行，RS485状态LED指示组合的进展
颜色和闪烁的活动模式。诊断模式条件有助于识别当前的自动模式
配置步骤（参见图1和安装说明）。
等待
活动
检测
波特率
检测
协议就绪检测
住址
图1：自动配置条件
在自动配置的检测协议阶段，仪表还检测串行格式，包括：
数据位数、奇偶校验和停止位数。BACnet标准规定了一种固定格式的
分别为8位、无奇偶校验和1位。仪表不支持将数据位或停止位配置为：
BACnet本身的性质实际上排除了有用的替代方案。然而，为了与非一致性实现兼容，仪表确实支持奇偶校验配置（请参阅MSV126）。
EM-RS485 BACnet协议指南8页共49页154-0022-0C
在自动配置的检测地址阶段，仪表从数据池中选择MAC地址
在MS/TP本地网络上检测到未使用的地址。候选地址将在之后添加到池中
主请求的两次连续轮询超时，无应答。仪表通常需要15-30秒来测量
确定候选仪表（如果同时连接多个新仪表，则时间会更长）。
为了减少与可能也在选择自动MAC地址的其他设备的冲突
地址选择包括一个小的随机分量。然而，随机分量是强偏置的
朝向较低地址（以保持令牌环效率高）。此外，仪表进行两次测试以确认：
候选地址确实未使用：
•一次测试确认两个设备没有同时选择相同的MAC地址。
•二次测试确认没有MS/TP从设备占用选定的MAC地址。
（从属设备不会自然响应主请求的轮询）。
如果任一测试失败，仪表将放弃所选地址并恢复观察。如果似乎存在
没有未使用的地址，仪表将无限期观察。出现这种情况的原因有几个：
•没有MS/TP主设备为主请求生成轮询。
•所有MS/TP主地址0-127都已分配给其他设备。
•Max Master属性设置为小于127，所有MAC地址从0到Max MASTEL
已分配给其他设备。
自动配置完成后，RS485状态指示灯变为绿色。假设没有冲突
然后，控制器可以发现仪表以查询或配置各种对象。区分
如果发现多个仪表，请检查标签上打印的序列号的后三位数字。这个
仪表通过在序列号的后三位添加“665000”来设置默认设备ID。
序列号123456
456
+665000
665456
3456
图2：默认设备ID
仪表将发现的任何自动配置结果存储在非易失性存储器中并重新加载
每当仪表复位时（例如，断电后）。自动配置（包括MAC地址）可以：
重置仪表时，按下设置按钮可清除此项（例如，卸下并重新接通电源）。
用户配置的参数不会受到影响，但仪表必须在安装前重新检测缺失的参数
重新建立与控制器的通信。
警告：在将具有自动选择的MAC地址的仪表移动到新网络之前，请确保：
不会有冲突！如有必要，重置自动配置或手动设置新地址。
对于久安装，可以设置协议配置参数（见AV123、AV124、MSV126）
锁定波特率、串行格式和协议。然而，这将阻止仪表适应
网络环境的未来变化

1769-L33ER

1769-L33ER
Congratulations on installing your new Senva EM-RS485 energy meter! This BACnet Protocol Guide assumes the first stage of installation is complete, with the meter and any CVTs connected and powered. A green Device Statusindicates the meter is powered and ready. If not, refer to the separate Installation Instructions before continuing. Now, only the network configuration remains between you and the data. Leave the meter in the default factory mode for automatic network configuration: • Automatic Baud Rate detection (see BV114, AV124): 9600 – 115200 baud • Automatic Protocol detection (see BV112, MSV122): BACnet • Automatic MAC Address selection (see BV113, AV123): 0 – 127 To begin automatic configuration, simply connect the RS485 terminals to an active MS/TP network. An active MS/TP network consists of at least one MS/TP master device (typically a gateway or controller). Once connected, the meter observes RS485 activity to learn Baud Rate, Protocol, and MAC Address. Without activity, the meter cannot learn! The meter will not interfere with existing network traffic during the observation phase. As configuration proceeds, the RS485 Status LED indicates progress with a combination of color and blinking activity patterns. Diagnostic mode conditions can help identify the current auto configuration step (see Figure 1, and also the Installation Instructions). Waiting For Activity Detecting Baud Rate Detecting Protocol Ready Detecting Address Figure 1: Automatic Configuration Conditions In the Detecting Protocol phase of automatic configuration, the meter also detects serial format, comprising the number of Data Bits, Parity, and number of Stop Bits. The BACnet standard specifies a fixed format of 8 bits, no parity, and 1 bit respectively. The meter does not support configuration of Data Bits or Stop Bits as the nature of BACnet itself effectively precludes useful alternatives. However, for compatibility with nonconforming implementations the meter does support Parity configuration (see MSV126). EM-RS485 BACnet Protocol Guide Page 8 of 49 154-0022-0C In the Detecting Address phase of automatic configuration, the meter selects a MAC Address from a pool of unused addresses detected on the MS/TP local network. Candidate addresses are added to the pool after two successive Poll-For-Master requests time out with no reply. A meter typically needs 15 – 30 seconds to identify candidates (somewhat longer if many new meters are connected at once). To reduce collisions with other devices that may be also selecting an automatic MAC Address, the final address selection includes a small random component. However, the random component is strongly biased towards lower addresses (to keep the token ring efficiency high). Also, the meter makes two tests to confirm that the candidate address is really unused: • The first test confirms that two devices have not simultaneously selected the same MAC Address. • The second test confirms that there is no MS/TP slave device occupying the selected MAC Address . (A slave device would not naturally respond to the Poll-For-Master requests). If either test fails, the meter abandons the selected address and resumes observation. If there appears to be no unused addresses, the meter will observe indefinitely. This may occur for a few reasons: • There is no MS/TP master device generating Poll-For-Master requests. • All MS/TP master addresses 0 – 127 are already assigned to other devices. • The Max Master property has been set smaller than 127, and all MAC addresses from 0 – Max Master are already assigned to other devices. The RS485 Status LED turns green after auto configuration completes. Assuming no conflicts, a BACnet controller can then discover the meter to query or configure the various objects. To differentiate between multiple discovered meters, check the last three digits of the unique serial number printed on the label. The meter sets the default Device ID by adding “665000” to the last three digits of the serial number. SN 123456 456 +665000 665456 3456 Figure 2: Default Device ID The meter stores any discovered automatic configuration result in non-volatile memory and reloads them whenever the meter resets (e.g. after power loss). The automatic configuration (including MAC Address) can be cleared by pressing the Setup Button while resetting the meter (e.g. removing and reapplying power). User-configured parameters will not be affected, but the meter must redetect missing parameters before reestablishing communication with the controller. WARNING: Before moving a meter with an automatically selected MAC Address to a new network, ensure there will be no conflicts! If necessary, reset the automatic configuration or set a new address manually. For permanent installations, the protocol configuration parameters (see AV123, AV124, MSV126) may be set to lock the baud rate, serial format, and protocol. However, this will prevent the meter from adapting to future changes in the network environment. EM-RS485 BACnet Protocol Guide Page 9 of 49 154-0022-0C Device • Object Identifier W Default: 665XXX (see Configuration) • Object Name W 30 characters maximum • Object Type R • System Status R • Vendor Name R • Vendor Identifier R • Model Name R • Firmware Revision R • Application Software Version R • Location W 30 characters maximum • Description W 30 characters maximum • Protocol Version R • Protocol Revision R • Protocol Services Supported R • Protocol Object Types Supported R • Object List R Too large to be read with a single Read-Property request; must be read element by element • Max APDU Length Accepted R • Segmentation Supported R • APDU Timeout R • Number of APDU Retries R • Max Master W 1 – 127; see AV123 • Max Info Frames W 0 – 255; see AV123 • Device Address Binding R • Database Revision R • Serial Number R Matches the serial number printed on the label • Last Restart Reason R • Time of Device Restart R • Local Date R Volatile; must be set via Time-Synchronization • Local Time R Volatile; must be set via Time-Synchronization • Property List R • Device Features R Proprietary property ID 6650 This read-only property, of type Bit String, enumerates various the hardware features of a meter. Each ‘1’ represents a feature that is present. 1. RS485 (always present) 2. Pulse Outputs 3. Pulse Inputs 4. Internal Thermistor 5. Setup Button EM-RS485 BACnet Protocol Guide Page 10 of 49 154-0022-0C Accumulators (Pulse Input) • Object Identifier R • Object Name R • Object Type R • Present Value W Only writable when Out Of Service is True • Status Flags R • Event State R Always Normal • Reliability W Only writable when Out Of Service is True • Out of Service W • Units of Measure W • Maximum Present Value W Default 4294967295 (232 – 1) • Scale W • Pre-Scale W • Value Change Time R Only valid if the system time is valid • Value Before Change R • Value Set W • Property List R ACC210 Pulse Input 1 R/NV ACC220 Pulse Input 2 R/NV Returns the count of pulses received at the respective pulse terminal (see Installation Instructions). NOTE: The corresponding Binary Inputs(BI201/BI202) track the instantaneous state of the terminal. Each count in the Present Value represents a pair of input edges (active low), registered on the leading (falling) edge. At each transition, the input delays by the Debounce Time (see AV208). 1 2 3 4 Figure 3: Pulse Input Counting The Present Value will count to the Maximum Present Value before overflowing to 0. If setting the Maximum Present Value smaller than the Present Value, the Present Value does not update until the next pulse input event. The Pre-Scale property may be configured to convert an input pulse stream to a suitable scale or engineering unit. The Pre-Scale factor consists of a pair of integer coefficients 𝑵 and 𝑴: 𝑪𝑷𝑽 = 𝑵 𝑴 × 𝑪𝑰𝑵 where: CPV = final count stored in the Present Value CIN = raw count detected at the pulse input terminal EM-RS485 BACnet Protocol Guide Page 11 of 49 154-0022-0C Integer coefficients permit exact (lossless) conversion, following the algorithm prescribed in the BACnet standard. 𝑵 and 𝑴 must be positive integers less than or equal to 65535 (232 – 1). Many common floating point factors can be expressed as a ratio of two integers. For efficiency, consider reducing scaling factors to the lowest common denominator. For example: 0.1 = 1 / 10 0.95 = 19 / 20 [ 95 / 100 ] 1.333� = 4 / 3 [ (1.333� ∙ 10 – 1.333�) / (10 – 1) ] 1.5 = 3 / 2 [ 15 / 10 ] The Pre-Scale conversion operates directly on a stream of input pulses. Changing coefficients does not alter the Present Value, but the effect of the transition on any internal remainder is undefined. The Scale and Units of Measure properties store arbitrary values. These may be useful to attach relevant metadata directly to a pulse input object, but they do not directly affect the counting operation. The Value Set property allows accumulator initialization. This may be useful for continuity when the EM-RS485 replaces an existing meter. When set, Value Set follows the defined BACnet procedure: 1. The current Present Value is preserved in Value Before Change. 2. The value is stored in both Value Set and Present Value. 3. If valid, the current date and time are stored in Value Change Time