140DSI35300模块备件

140DSI35300

ASI模块通过
连接到I/O扩展器总线的共享内存接口。
ASI模块不断更新共享内存设备
（双端口RAM）和输入的当前值。控制器可以随时读取这些值，即使ASI模块同时写入双端口RAM。
ASI模块为I/O扩展器使用自定义门阵列
总线接口。集成电路保存所有控制逻辑
以及通信协议。该集成电路提供：
这些功能：
•地址比较和检测。
•信息解码和翻译。
•总线信号的数据线滤波。
•车载巴士司机。
•扩展器总线监视器。
双端口RAM存储可同时访问的数据
时间由控制器和I/O模块的微控制器确定。
数据值
对于所有输入，根据出厂校准调整通道值。热电偶输入接收冷接点参考补偿。导线电阻调整为：
必要时执行（仅用于冷连接参考）。
ASI模块通过I/O向控制器提供值
扩展器总线。这些值以工程单位表示。
ASI模块向控制器发送状态指示，用于：
每个输入通道。此状态表示任何硬件错误
以及由ASI模块检测到的信道配置错误。
终端单元
IMASI23模块使用一个NTAI06终端单元连接到现场信号。NKAS01或NKAS11电缆连接
终端单元通过其P3连接器连接到ASI模块。
终端单元包含用于冷连接的RTD
热电偶输入的补偿。它们还包含
将4至20毫安磁场信号转换所需的电路
输入至模拟输入所需的1至5 VDC
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自动调整和校正
单元NTAI06终端装置上的保险丝保护系统电源免受短路。
功能代码
注：有关所需的功能代码规范更改，请参阅附录C
用IMASI23模块替换IMASI03模块时。
控制器中的FCs 215和216配置ASI模块
并识别活动模拟输入。需要一个FC 215
对于每个ASI模块。每个输入需要一个FC 216
ASI模块上使用的信道。这些功能代码指定：
ASI模块的I/O扩展器总线地址和连接到特定模拟输入的模块上的通道号
信号
工程中的输入类型、零点和量程
还必须指定单位，以确保校准、冷结补偿和非线性校正的适当缩放和校正。
将FC 215和216添加到控制器以配置ASI模块。在控制器中设置FC 217以校准ASI模块，或
以设置用户增益和偏移值。参考作曲家
有关详细信息，请参阅功能代码应用手册。
自动调整和校正
输入处理、校准、点值计算、铅
导线电阻调整、冷端补偿、增益
偏移调整和工程单位转换都是
由ASI模块自动执行。
输入处理
每个A/D转换器连续采样输入信号
而不需要开始转换命令。A/D输出
寄存器以内部过滤器确定的速率更新
并且可以随时准备好。ASI模块扫描所有A/D
转换器输出寄存器的速率约为180毫秒
包括校准和开路测试。
除了输入通道外，内置的co

140DSI35300

140DSI35300

The ASI module communicates with the controller through a
shared memory interface connected to the I/O expander bus.
The ASI module constantly updates the shared memory device
(dual port RAM) with the current values of the inputs. The controller can read these values at any time, even if the ASI module is simultaneously writing to the dual port RAM.
The ASI module uses a custom gate array for the I/O expander
bus interface. An integrated circuit holds all the control logic
and communication protocol. This integrated circuit provides
these functions:
• Address comparison and detection.
• Message decoding and translation.
• Data line filtering of bus signals.
• Onboard bus drivers.
• Expander bus watchdog.
A dual port RAM stores data that can be accessed at the same
time by the controller and the I/O module's microcontroller.
Data Values
For all inputs, channel values are adjusted based on the factory calibration. Thermocouple inputs receive cold junction reference compensation. Lead wire resistance adjustments are
performed when necessary (for cold junction reference only).
The ASI module provides values to the controller over the I/O
expander bus. These values are in engineering units.
The ASI module sends a status indication to the controller for
each input channel. This status indicates any hardware errors
and channel configuration errors detected by the ASI module.
Termination Units
The IMASI23 module uses one NTAI06 termination unit to connect to field signals. An NKAS01 or NKAS11 cable connects the
termination unit to the ASI module through its P3 connector.
The termination unit contains RTDs used for cold junction
compensation of thermocouple inputs. They also contain the
circuitry needed to convert 4 to 20 milliampere field signals
into the 1 to 5 VDC needed to input to the analog input 
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Automatic Adjustments and Corrections
module. The system power supply is protected from short circuits by fuses on the NTAI06 termination unit.
Function Codes
NOTE: Refer to Appendix C for function code specification changes required
when replacing an IMASI03 module with an IMASI23 module.
FCs 215 and 216 in the controller configure the ASI module
and identify the active analog inputs. One FC 215 is required
for each ASI module. One FC 216 is required for each input
channel used on the ASI module. These function codes specify
the I/O expander bus address of the ASI module and the channel number on the module connected to a specific analog input
signal.
The type of the input and the zero and span in engineering
units must also be specified to ensure proper scaling and corrections for calibration, cold junction compensation, and nonlinearity correction.
Add FC 215 and 216 to the controller to configure the ASI module. Set FC 217 in the controller to calibrate the ASI module or
to set the user gain and offset values. Refer to the Composer
Function Code Application Manual for more information.
Automatic Adjustments and Corrections
Input processing, calibration, point value calculations, lead
wire resistance adjustment, cold junction compensation, gain
and offset adjustment, and engineering unit conversions are all
automatically performed by the ASI module.
Input Processing
Each A/D converter samples the input signal continuously
without need for a start convert command. The A/D output
register is updated at a rate determined by the internal filter
and can be ready at any time. The ASI module scans all A/D
converter output registers at a rate of about 180 milliseconds
including calibration and open circuit tests.
In addition to the input channels, the built-in co