HONEYWELL 8937-HN工控卡件,8937-HN使用速度
PLC使用%AI數據表中的數據記錄模擬值以供使用通過可編程控制器。對于16通道，該方案如圖3-25所示模擬電流輸入模塊。有關CPU與模擬接口的更多詳細信息模塊可在本章開頭找到。絕對精度±0.25%滿標度@25 C（77 F）：±0.5%滿標度超過規定值工作溫度范圍線性<1 LSB，從4到20 mA（4到20 mA范圍）小于1 LSB，從100μA到20 mA（0到20 mA和4至20 mA增強范圍）磁場側和邏輯側之間的隔離1500伏共模電壓0伏（單端信道）直流至1 kHz的交叉通道抑制>80 db輸入阻抗250歐姆輸入低通濾波器響應19 Hz外部電源電壓范圍20至30 VDC
HONEYWELL 8937-HN工控卡件外部電源電壓紋波10%背板上+5伏總線的內部功耗為120 mA來自24 VDC外部用戶電源的65 mA（除電流環外），因為模擬模塊中使用的轉換器是12位轉換器，而不是數據中的所有16位表包含轉換所需的數據。12位的一個版本放在16位中與模擬點對應的數據字（在%AI表中）。90-30系列PLC系統不同模擬模塊的集成處理方式不同。CPU在將輸入模塊中的數據放入字之前不會對其進行操作在%AI數據表中。%AI數據表中未在轉換中使用的位模擬輸入模塊將輸入模塊強制為0（零）。12個數據的放置來自A/D轉換器的位，用于16通道模擬電路的模擬電流輸入數據字電流輸入模塊如下所示。
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.
