HONEYWELL 8937-HN工控卡件,8937-HN使用速度
PLC使用%AI数据表中的数据记录模拟值以供使用通过可编程控制器。对于16通道，该方案如图3-25所示模拟电流输入模块。有关CPU与模拟接口的更多详细信息模块可在本章开头找到。绝对精度±0.25%满标度@25 C（77 F）：±0.5%满标度超过规定值工作温度范围线性<1 LSB，从4到20 mA（4到20 mA范围）小于1 LSB，从100µA到20 mA（0到20 mA和4至20 mA增强范围）磁场侧和逻辑侧之间的隔离1500伏共模电压0伏（单端信道）直流至1 kHz的交叉通道抑制>80 db输入阻抗250欧姆输入低通滤波器响应19 Hz外部电源电压范围20至30 VDC
HONEYWELL 8937-HN工控卡件外部电源电压纹波10%背板上+5伏总线的内部功耗为120 mA来自24 VDC外部用户电源的65 mA（除电流环外），因为模拟模块中使用的转换器是12位转换器，而不是数据中的所有16位表包含转换所需的数据。12位的一个版本放在16位中与模拟点对应的数据字（在%AI表中）。90-30系列PLC系统不同模拟模块的集成处理方式不同。CPU在将输入模块中的数据放入字之前不会对其进行操作在%AI数据表中。%AI数据表中未在转换中使用的位模拟输入模块将输入模块强制为0（零）。12个数据的放置来自A/D转换器的位，用于16通道模拟电路的模拟电流输入数据字电流输入模块如下所示。
The Series 90-30 PLC uses the data within the %AI data table to record analog values for use
by the programmable controller. This scheme is shown in Figure 3-25 for the 16-Channel
Analog Current Input module. More detailed information on the CPU interface to analog
modules can be found at the beginning of this chapter.Absolute Accuracy ± 0.25% of full scale @ 25C (77F): ± 0.5% of full scale over specified
operating temperature range
Linearity < 1 LSB from 4 to 20 mA (4 to 20 mA range)
< 1 LSB from 100 µA to 20 mA (0 to 20 mA and
4 to 20 mA Enhanced ranges)
Isolation 1500 volts between field side and logic side
Common Mode Voltage 0 volts (single-ended channels)
Cross-Channel Rejection > 80 db from DC to 1 kHz
Input Impedance 250 ohms
Input Low Pass Filter Response 19 Hz
External Supply Voltage Range 20 to 30 VDC
External Supply Voltage Ripple 10%
Internal Power Consumption 120 mA from the +5 volt bus on the backplane
65 mA from 24 VDC external user supply (in addition to current loopSince converters used in the analog modules are 12-bit converters, not all of the 16 bits in the data
tables contain data required for the conversion. A version of the 12 bits is placed within the 16-bit
data word corresponding to the analog point (in the %AI table). The Series 90-30 PLC system
handles the integration differently for the various analog modules.
The CPU does not manipulate the data from the input modules before placing it within the word
in the %AI data table. The bits in the %AI data table which were not used in the conversion by
the input module are forced to 0 (zero) by the analog input module. Placement of the 12 data
bits from the A/D converter for an analog current input data word for the 16-Channel Analog
Current Input module is shown below.
