HIMA F3417A机器人备件
它们可以连接到模块的GND端子之一（通过内部路径连接到机架接地），如下图所示。如有必要提高噪声抗扰度，可使用导线将模块上的GND端子连接至接地，如图39所示。这将绕过模块周围的噪声。模拟源模拟输入模块GND可选接地导体接地模拟源模拟源模拟电源图39：连接到模块端子板PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装58 2.6.4.10.2电流传感器接线对于图40至图43中显示的所有示例，如果电源是浮动的，则将（-）导线连接到模拟输入模块COM端子，以限制共模电压。共模电压限制为11伏。如果噪声导致读数不准确，（-）导线也可以连接到模拟输入模块GND端子。+/-AC/DC 4WT+-模拟输入模块C G COM GND仅在现场设备端将电缆屏蔽接地图40：4线传感器，外部由交流或直流电源供电+-PS+2WT-模拟输入模件C G COM地线+-仅在现场装置端将电缆保护接地图41：2线传感器，外部由直流电源供电+-PS 3WT+-模拟输入模块C G COM GND+-仅现场设备端电缆屏蔽接地图42：3线传感器，外部由直流供电+-2WT+-仅模拟输入模块G COM GND接地现场设备端的电缆屏蔽图43：2线传感器，自供电PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装59附录A：连接到两个测量设备的2线传感器如图44所示，如果电源是浮动的，将（-）导线连接到模拟输入模块COM端子，以限制共模电压。共模电压限制为11伏。如果噪声导致读数不准确，（-）导线也可以连接到模拟输入模块GND端子。模拟模块必须是电路上的最后一个设备。当模拟输入模块的（-）返回侧接地时，其他电流传感装置必须是浮动的，并且能够承受至少20 V的共模电压，包括噪声水平。+/-PS 2WT+-仅模拟输入模块C G COM GND+-电流传感设备+-图44：连接到两个测量设备的2线传感器2.6.4.10.3验证模拟输入电流RX3i模拟电流输入模块在输入端子两端具有内部250W电阻器。您可以使用电压表测量输入端子两端的电压，然后使用欧姆定律确定输入电流：输入电流（安培）=V/250例如，如果您在输入端子两端测量到3 V：输入电流（单位：安培）=3/250输入电流（安培）=0.012（或12 mA）PACSystems*RX3i系统手册第3节GFK-2314T 2019年9月安装60 2.6.4.10.4模拟输出模块的屏蔽连接对于模拟输出模块，屏蔽通常仅在源端接地（即模块-图45）。GND连接提供了对背板（机架接地）的访问，从而对任何屏蔽漏极电流引起的噪声产生了卓越的抑制。在极端噪声环境中，您可以将可选的接地编织线从GND端子连接到外部接地，以绕过模块周围的噪声。模拟输出模块用户负载COM OUT GND COM OUT屏蔽仅连接在模块端用户负载可选接地导体接地图45：模拟输出模块PACSystems的屏蔽连接*RX3i系统手册第3节GFK-2314T 2019年9月安装61附录A：模拟输出屏蔽接地，带端子排如果模拟输出模块和现场设备（用户负载），使用图46中的方法接地电缆屏蔽。每条电缆仅一端接地，一端靠近模拟输出模块。对于需要额外噪声抑制的安装，图示了模块GND端子的可选外部接地连接。
They can be connected to one of the GND terminals of the module (which are connected to frame ground through an internal path) as shown left below. If necessary to improve noise immunity, a conductor can be used to connect a GND terminal on the module to earth ground as displayed in Figure 39. This will bypass noise around the module. Analog Source Analog Input Module GND Optional Ground Conductor Earth Ground Analog Source Analog Source Analog Source Figure 39: Analog Input Shields Connected to Module Terminal Board PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 58 2.6.4.10.2 Wiring for Current Transducers For all of the examples displayed in Figure 40 through Figure 43, connect the (-) conductor to the Analog Input module COM terminal, if the source is floating, to limit common-mode voltages. Common mode voltage is limited to 11 volts. If noise causes inaccurate readings, the (-) conductor can also be connected to the Analog Input module GND terminal. + - AC/DC 4WT + - Analog Input Module C G COM GND Ground the Cable Shield at field device end only Figure 40: 4-Wire Transducer, Externally Powered by AC or DC Supply + - PS + 2WT - Analog Input Module C G COM GND + - Ground the Cable Shield at field device end only Figure 41: 2-Wire Transducer, Externally Powered by DC Supply + - PS 3WT + - Analog Input Module C G COM GND + - Out Ground the Cable Shield at field device end only Figure 42: 3-Wire Transducer, Externally Powered by DC Supply + - 2WT + - Ground the Cable Shield at field device end only Analog Input Module C G COM GND Figure 43: 2-Wire Transducer, Self-Powered PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 59 Appendix A: 2-Wire Transducer Connected to Two Measuring Devices As shown in Figure 44, connect the (-) conductor to the Analog Input module COM terminal, if the source is floating, to limit common-mode voltages. Common mode voltage is limited to 11 volts. If noise causes inaccurate readings, the (-) conductor can also be connected to the Analog Input module GND terminal. The analog module must be the last device on the circuit. When grounding the (-) return side of the Analog Input Module, the other current-sensing device must be floating and able to withstand a common mode voltage of at least 20 V, including the noise level. + - PS 2WT + - Ground the Cable Shield at field device end only Analog Input Module C G COM GND + - Current Sensing Device + - Figure 44: 2-Wire Transducer Connected to Two Measuring Devices 2.6.4.10.3 Verifying Analog Input Current RX3i Analog Current Input Modules have an internal 250W resistor across the input terminals. You can measure the voltage across the input terminals using a voltmeter, then use Ohm’s Law to determine the input current: Input Current (in Amps) = V / 250 For example, if you measured 3 V across the input terminals: Input Current (in Amps) = 3/250 Input Current (in Amps) = 0.012 (or 12 mA) PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 60 2.6.4.10.4 Shield Connections for Analog Output Modules For analog output modules, the shield is normally grounded only at the source end (i.e. at the module - Figure 45). The GND connection provides access to the backplane (frame ground) resulting in superior rejection of noise caused by any shield drain currents. In extreme-noise environments, you can connect an optional ground braid from the GND terminal to an external earth ground to bypass noise around the module. Analog Output Module User Load COM OUT GND COM OUT Shield connected at module end only User Load Optional Ground Conductor Earth Ground Figure 45: Shield Connections for Analog Output Module PACSystems* RX3i System Manual Section 3 GFK-2314T Sept. 2019 Installation 61 Appendix A: Analog Output Shield Grounding with a Terminal Strip If there is a terminal strip between the analog output module and the field devices (user loads), use the method in Figure 46 for grounding the cable shields. Each cable is only grounded at one end, the end closer to the Analog Output Module. An optional external ground connection to the GND terminal of the module is illustrated for installations that require extra noise suppression.
