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一個(gè)指針給出的是變量的地址，而不是變量的數(shù)值大小。在有些功能塊中，可能使用指針編程更為方便。用定義指針類(lèi)型的形參，就能在功能塊中先使用一個(gè)虛設(shè)的指針，待調(diào)用功能塊時(shí)再為其賦予確定的地址。當(dāng)為指針參數(shù)類(lèi)型形參分配實(shí)參時(shí)，需要指明內(nèi)存地址，例如P#M50.0。
3. 塊調(diào)用過(guò)程及內(nèi)存分配
CPU提供塊堆棧(B堆棧)來(lái)存儲(chǔ)與處理被中斷塊的有關(guān)信息。當(dāng)發(fā)生塊調(diào)用或有來(lái)自更高優(yōu)先級(jí)的中斷時(shí)，就有相關(guān)的塊信息存儲(chǔ)在B堆棧里，并影響部分內(nèi)存和寄存器。圖5.2顯示了調(diào)用塊時(shí)B堆棧與L堆棧的變化。圖5.3提供了關(guān)于STEP 7的塊調(diào)用情況。
1) B堆棧與L堆棧
B堆棧是CPU系統(tǒng)內(nèi)存中的一部分，它存儲(chǔ)以下被中斷塊的數(shù)據(jù)：
(1) 塊號(hào)、塊類(lèi)型、優(yōu)先級(jí)、被中斷塊的返回地址；
(2) 塊寄存器DB、DI被中斷前的內(nèi)容；
(3) 臨時(shí)變量的指針(被中斷塊的L堆棧地址)。
STEP 7中可使用的B堆棧大小是有限制的，對(duì)于S7-300 CPU，則可在B堆棧中存儲(chǔ)8個(gè)塊的信息。因此，塊調(diào)用嵌套深度也是有限制的，多可同時(shí)激活8個(gè)塊。
L堆棧是CPU內(nèi)存中的一部分，它在塊調(diào)用時(shí)被重新分配。L堆棧用來(lái)存儲(chǔ)邏輯塊中定義的臨時(shí)變量，也分配給臨時(shí)本地?cái)?shù)據(jù)使用。梯形圖的方塊指令與標(biāo)準(zhǔn)功能塊也可能使用L堆棧存儲(chǔ)運(yùn)算的中間結(jié)果。
2) 調(diào)用功能塊FB
當(dāng)調(diào)用功能塊FB時(shí)，會(huì)有以下事件發(fā)生：
(1) 調(diào)用塊的地址和返回位置存儲(chǔ)在塊堆棧中，調(diào)用塊的臨時(shí)變量壓入L堆棧；
(2) 數(shù)據(jù)塊DB寄存器內(nèi)容與DI寄存器內(nèi)容交換；
(3) 新的數(shù)據(jù)塊地址裝入DI寄存器；
(4) 被調(diào)用塊的實(shí)參裝入DB和L堆棧上部；
(5) 當(dāng)功能塊FB結(jié)束時(shí)，先前塊的現(xiàn)場(chǎng)信息從塊堆棧中彈出，臨時(shí)變量彈出L堆棧；
(6) DB和DI寄存器內(nèi)容交換。
當(dāng)調(diào)用功能塊FB時(shí)，STEP 7并不一定要求給FB形參賦予實(shí)參，除非參數(shù)是復(fù)式數(shù)據(jù)類(lèi)型的IO形參或參數(shù)類(lèi)型形參。如果沒(méi)有給FB形參賦予實(shí)參，則功能塊FB就調(diào)用背景數(shù)據(jù)塊內(nèi)的數(shù)值。該數(shù)值是在功能塊的變量聲明表內(nèi)或背景數(shù)據(jù)塊內(nèi)設(shè)置的形參初始數(shù)值。
3) 調(diào)用功能塊FC
當(dāng)調(diào)用功能塊FC時(shí)會(huì)有以下事件發(fā)生：

ACCURAY 083892002 NSPP 083892002
ACCURAY KEYBOARD DISPLAY MODULE CIRCUIT CONTROL CIRCUIT CARD BOARD 59045
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ACCURAY HONEYWELL 085345-001 OAD SCANNER CONTROL MODULE REVISION REV C 59006
ACCURAY 64811-002 USPP 64811002
ACCURAY 64860-002 USPP 64860002
ACCURAY 9-064856-001 POWER FAILSAFE MODULE CARD BOARD 58668
ABB ACCURAY 1-084902-001 REV CB TEST PANEL MODULE CARD BOARD 58734
ACCURAY 2-085155-001 PC PCB CONTROL PRINTED CIRCUIT BOARD MODULE CARD 58690
ACCURAY 3-083142-001 SCANNER CONTROL BOARD CARD MODULE PCB 51909
ACCURAY 062798-002 NSFP 062798002
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ACCURAY 5-053788-001 1.5IN LED DEDICATED PROCESS DISPLAY MODULE 58671
ACCURAY 2-064810-002 OPERATOR INTERFACE LAMP DRIVER MODULE CARD BOARD 58343
ACCURAY 2-064810-002 OPERATOR INTERFACE LAMP DRIVER MODULE CIRCUIT BOARD 58675
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ACCURAY 60132860 BPNL1508-001 SECURITY CONTROL DISPLAY PANEL MODULE 58807
AccuRay 9-085159-001 Rev. BB PPC Board
ACCURAY 083898-010 USPP 083898010
ACCURAY 1-61552-002 61552002 MPR MODULE BOARD SCANNER 55102
ACCURAY 083898-011 USPP 083898011
ACCURAY 8-085217-001 INPUT OUTPUT I/O PRINTED PC CIRCUIT BOARD MODULE CARD 58647
ACCURAY 5-053788-001 1.5IN LED DEDICATED PROCESS DISPLAY MODULE 58672
ACCURAY 2-064810-002 OPERATOR INTERFACE LAMP DRIVER MODULE CARD BOARD 58674

1PF1R4-19/10.00-500R

ACUITY IMAGING CM4000 USPP CM4000
ACUITY CM4000 CAMERA CCD BLACK/WHITE MINIATURE NEW
Acuity Imaging 070-200000 B 208008 045-200001 C 208446 045-201000 Frame Grabber
RVSI Acuity Imaging 070-200200 045-200400 Frame Grabber
RVSI Acuity Imaging 070-200200 Rev C PCI Frame Grabber
RVSI Acuity Imaging 070-200000 045-200001 Frame Grabber
ACUITY (RVSI) DMR600 DMR 600 ROBOT DATA MATRIX READER MODULE
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RVSI AS-MS20 Acuity IVS Series Camera Controller
RVSI ACUITY CIMATRIX SCANSTAR 10 USPP SCANSTAR10
RVSI Acuity IVS Series Installed SR20 Symbology Reader
PROPAQ ENCORE 202 EL PATIENT VITAL MONITOR WITH NETWORK ACUITY MODEM
RVSI Acuity Simatic Visionscape I/O Control Board New
RVSI ACUITY 070-203000 REV B I/O CONTROL BOARD SIMATIC VISIONSCAPE NEW
NIB Acuity Camera CM4000_CM4OOO
LAMP LIGHT BULB: ACUITY A09501
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RVSI Citmatrix Vision Camera CM4000 Acuity Imaging #36177
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ACUITY IMAGING 604406 USPP 604406
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RVSI ACUITY CIMATRIX HEPS-1500 NSFP HEPS1500

1PF1R4-19/10.00-500R

Ametek Digistrobe
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Ametek AccuForce Cadet Force Gage Used
AMETEK TRANSDUCER 1986G2GR64SX
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NEW USG SOLFRUNT AMETEK PRESSURE GAUGE 0-30 PSI SB DIAPHRAGM 316L SST
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Lamb-Ametek #116158-01 36V 5.7 2 Stage Vacuum Motor
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LAMB AMETEK VACUUM MOTOR 116378-07 120 VOLTS 50/60 HZ
Ametek USG Vacuum/Pressur?e Gauge 170878
AMETEK TAK-ETTE 1716 DIGITAL TACHOMETER TACH METER
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1PF1R4-19/10.00-500R