WESDAC D20 C模塊
跟蹤命令輸入TC，斷言為高（1），導(dǎo)致用于跟蹤輸入變量TV的比率塊然后，重新計(jì)算的比值為R=TV/（A xE） 。R值將限制在高或低限制范圍設(shè)置。的出廠默認(rèn)設(shè)置比率限制為0.00-30.00。
可以使用快速設(shè)置調(diào)整比率如果參數(shù)“快速設(shè)置”設(shè)置為“是”，則為功能。這個(gè)比例將隨著旋鈕的轉(zhuǎn)動(dòng)而不斷變化調(diào)整。達(dá)到最終值時(shí)，按下存儲(chǔ)按鈕，以確保新的比率設(shè)置為：保持在冷通電狀態(tài)。QS DPP參數(shù)啟用比率調(diào)整分辨率的設(shè)置當(dāng)處于快速設(shè)置模式時(shí)。
如果輸入A或E未配置，其值將設(shè)置為1。如果輸入TC或TV未配置，則其值將設(shè)置為0。
TO（跟蹤輸出）通常用于使用外部設(shè)備在中設(shè)置比率的應(yīng)用中替換比率參數(shù)（然后將R設(shè)置為1.0）。當(dāng)需要具有比率塊軌跡的輸出時(shí)外部設(shè)備被迫跟蹤到的TV變量。
輸入E將等于TV/[Ax（1.0）]，因此比率塊輸出O1將等于TV。當(dāng)包含比率功能塊的配置在i|config中編輯，然后下載到在線控制器，控制器將忽略比率參數(shù)值的變化，并繼續(xù)以預(yù)加載值RCT_運(yùn)行。功能塊提供重復(fù)時(shí)間循環(huán)，可以用于邏輯定時(shí)操作或PID塊，以：提供由PID塊控制的自適應(yīng)接通時(shí)間。輸出ET將提供以下時(shí)間（以分鐘為單位）：在當(dāng)前循環(huán)（開+關(guān)）期間經(jīng)過。輸出RT是當(dāng)前循環(huán)中的剩余時(shí)間，將等于定時(shí)器未啟動(dòng)時(shí)的總循環(huán)時(shí)間（開+關(guān)）起動(dòng)。
對(duì)于固件1.30及更高版本，開啟和關(guān)閉時(shí)間為可在顯示器的整個(gè)范圍內(nèi)進(jìn)行調(diào)整，即：0.00000到9999999。在早期固件中，最短時(shí)間設(shè)置為0.1。如果延遲時(shí)間設(shè)置為小于掃描站的時(shí)間延遲時(shí)間將等于掃描時(shí)間。輸入S被斷言為高（1），將導(dǎo)致RCT塊開始計(jì)時(shí)循環(huán)。輸出O1將首先在時(shí)間由ON時(shí)間設(shè)置，然后在由OFF時(shí)間設(shè)置的時(shí)間內(nèi)它將變低（0）。它將繼續(xù)重復(fù)這個(gè)循環(huán)直到輸入S被斷言為低（0），這迫使O1為低（O）并結(jié)束定時(shí)周期。
Track Command input TC, asserted high (1), causes
the ratio block to track the input variable TV. The
ratio value to be recalculated is then R = TV / (A x
E). The value of R will be limited at the HI or LO
LIMIT range settings. The factory default settings of
the ratio limits are 0.00 - 30.00.
The RATIO can be adjusted using the QUICKSET
feature if parameter QUICKSET is set to YES. The
RATIO will continuously change as the knob is
adjusted. Press the STORE button when the final value is reached to insure that the new RATIO setting will be
retained on a Cold power up condition. The QS DPP parameter enables setting of the Ratio adjustment resolution
when in the QUICKSET mode.
If input A or E is not configured, it’s value will be set to 1. When input TC or TV is not configured, it’s value will
be set to 0.
The TO (Tracked Output) is normally used in applications where an external device is being used to set a ratio in
place of the RATIO parameter (R is then set to 1.0). When it is desired to have the output of the RATIO block track
the TV variable, the external device is forced to track TO. Input E will then equal TV/[Ax(1.0)] and, therefore, the
RATIO block output O1 will equal TV. When a configuration containing the RATIO function block is edited in i|config and then downloaded to an on-line
controller, the controller will ignore a change to the RATIO parameter value and continue to run with the predownload value RCT_ function blocks provide repeat time cycles that can
be used in logic timing operations or with PID blocks to
provide adaptive on times controlled by the PID block.
Output ET will provide the time in minutes that has
elapsed during the current cycle (ON + OFF). Output RT
is the remaining time in the current cycle and will equal the
total cycle time (ON + OFF) when the timer has not been
started.
With firmware 1.30 and higher, the ON and OFF TIME is
adjustable over the full range of the display which is
0.00000 to 999999. In earlier firmware, the minimum time
setting was 0.1. If the delay time is set to less than the scan
time of the station the delay time will equal the scan time.
Input S, asserted high (1), will cause the RCT block to start the timing cycle. Output O1 will first go high (1) for a
time set by ON TIME and then it will go low (0) for a time set by OFF TIME. It will continue to repeat this cycle
until input S is asserted low (0) which forces O1 low (0) and ends the timing cycle.
