SD812F模塊,說明書SD812F
HSS模塊使用16位微處理器控制板功能，并通過輸入/輸出擴(kuò)展器總線接口。微處理器控制模數(shù)處理，將位置反饋和sta 2; tus信息傳遞給MFP模塊，從中讀取控制數(shù)據(jù)MFP模塊將位置需求寫入D/A轉(zhuǎn)換器并進(jìn)行自檢。
微處理器還控制硬手動(dòng)電路。這電路提供用戶連接到24 VDC的隔離觸點(diǎn)，為操作員提供啟動(dòng)液壓控制的方法如果MFP模塊通信丟失，則執(zhí)行器。
通過激活升高或降低觸點(diǎn)，操作員告知微處理器改變執(zhí)行器位置。微處理器還寫入數(shù)字輸出，告訴操作員模塊處于硬手動(dòng)操作模式。
SD812F模塊位置需求和輸出位置需求和輸出模塊包括四個(gè)部分：
?D/A轉(zhuǎn)換器。
?位置誤差。
?伺服放大器。
?抖動(dòng)振蕩器。
輸出電路提供比例積分整個(gè)伺服閥的微分（PID）閉環(huán)控制系統(tǒng)此外，微處理器讀取伺服狀態(tài)并通過該輸出塊選擇要輸出到的伺服。
圖2-3顯示了職位需求的簡化圖和輸出電路。
The HSS module uses a 16-bit microprocessor to control board
functions and communicate with the MFP module through the
I/O expander bus interface. The microprocessor controls the
analog-to-digital processing, passes position feedback and sta
tus information to the MFP module, reads control data from
the MFP module, writes position demands to the D/A converter
and does self checks.
The microprocessor also controls the hard manual circuit. This
circuit provides isolated contacts the user connects to 24 VDC,
giving the operator a way to initiate control of the hydraulic
actuator in the event the MFP module communications is lost.
By activating the raise or lower contacts, the operator tells the
microprocessor to change the actuator position. The micropro
cessor also writes to a digital output to tell the operator the
module is in the hard manual mode of operation.
Position Demand and Output
There are four parts to the position demand and output block:
?
D/A converter.
?
Position error.
?
Servo amplifier.
?
Dither oscillator.
The output circuit provides proportional plus integral plus
derivative (PID) closed loop control on the entire servo valve
system. Additionally, the microprocessor reads servo status
and selects which servo to output to through this output block.
Figure 2-3 shows a simplified diagram of the position demand
and output circuit.
