ABB DSTC175 57310001-KN

模块终端单元(MTU)将模块总线分配给I/O模块 以及下一个MTU。

I/O模块具有开放式通风塑料外壳。在所有I/O的前端模块至少有三个发光二极管(故障、运行和警告)指示模块状态。此外，一些模块有指示OSP或主要参见表3和表4。在完全运行的I/O站中，可以更换I/O模块。机械键控 on模块和MTU防止I/O模块被插入以下位置它们可能会被过高的电压或电流损坏。电子打字每个模块中的标识ID防止输入/输出模块被带入如果模块的ID与配置的不匹配，则由ModuleBus主机进行操作模块类型定义。有单个模块和冗余模块应用程序。

电流输入能够处理变送器电源的短路，而不会损坏。输入耐受HART通信。标称输入范围为:0(4)...+20毫安，0(2)...+10 V。 AI815模拟输入模块，0..20mA，0..5V，HART AI815模拟输入模块有8路模拟输入。可以对输入进行配置电压或电流。该模块具有HART直通功能。标称输入范围为:0(4)...+20毫安，0(1)...+5 V。 AI820差分模拟输入模块，±20毫安，±10伏，±5伏 AI820差分模拟输入模块有4个差分、双极电流/电压输入。该模块适用于要求高共模抑制额定值和/或双极性电压或电流输入。

The module terminal unit (MTU) assigns the module bus to the I/O module and the next MTU.

The I/O module has an open ventilated plastic casing. At least three light-emitting diodes (fault, operation, and warning) indicate the module status in the front-end modules of all I/O. In addition, some modules have indications for OSP or mainly refer to Tables 3 and 4. In a fully operational I/O station, I/O modules can be replaced. The mechanical keying on module and MTU prevent the I/O module from being inserted into the following positions, which may be damaged by excessive voltage or current. The identification ID in each module of electronic typing prevents input/output modules from being brought in. If the module ID does not match the configured one, the ModuleBus host will define the operation module type. There are single module and redundant module applications.

The current input can handle short circuits in the transmitter power supply without damage. Input is tolerant to HART communication. The nominal input range is: 0 (4)+ 20 mA, 0 (2)+ 10 V. AI815 analog input module, 0.20mA, 0.5V, HART AI815 analog input module has 8 analog inputs. The input can be configured for voltage or current. This module has a HART pass-through function. The nominal input range is: 0 (4)+ 20 mA, 0 (1)+ 5 V. The AI820 differential analog input module has 4 differential, bipolar current/voltage inputs for ± 20 mA, ± 10 V, and ± 5 V. This module is suitable for high common mode suppression ratings and/or bipolar voltage or current inputs.