9025BCW46
日期：2020-7-9
数字量/模拟量输出表规定的是当CPU处于停机（STOP）状态时，数字量输出点或者模拟量输出通道如何操作。
此功能对于一些必须保持动作、运转的设备非常重要。如抱闸，或者一些关键的阀门等，不允许在调试PLC时停止动作，就必须在系统块的输出表中进行设置。
数字量：在选中“Freezeoutputinlaststate”后，冻结最后的状态，则在CPU进入STOP状态时数字量输出点保持停机前的状态（是1仍然是1，是0保持为0），同时下面的b.表不起作用如果未选中，那么选中的输出点会保持ON（1）的状态，未选中的为0。
模拟量：在选中“Freezeoutputinlaststate”后，冻结最后的状态，则在CPU进入STOP状态时模拟量输出通道保持 停机前的状态，同时下面的表不起作用，未选中时.在下面表中各个规定模拟量输出通道在答：完全可以，STEP 7 MicroWIN V4.0SP4是S7-200PLC的编程软件，而STEP7_V5.4_SP3_CN 是S7-300/400系列产品的编程软件。互不干扰。 CPU进入STOP状态时的输出值。
CPU中的V存储区（数据块）中为TD 200分配的参数块地址又被其它程序重复使用，改变了TD 200参数块首地址中的信息（ASCII字符'TD'）。
CPU存储区中TD 200参数块的首地址，与TD 200中Setup菜单中的设置不同。这种现象常出现在更换TD 200备件时。
一个CPU可以连接几个TD 200？一个TD 200可以连接几个CPU？
CPU通讯口可以连接3个TD 200。如果每个TD 200的数据块各不相同，要注意在TD 200中所能设置的数据块起始地址最大为VB999。
如果CPU上的通讯口被占用，或者连接数目不够，可以在CPU上附加EM277模块（CPU221除外），EM277的连接数是5个TD 200。
一个TD 200在一个时刻只能与一个CPU通讯。
问：刚接触西门子S7-300 PLC与MM440变频器通过DP通信，其中资料提到PKW PZD,比如在读写0002-1999的参数时，"如读P1082, 1082=43A(HEX)
PLC PKW输出=143A,0000,0000,0000 1为读请求。PLC PKW输入=243A,0000,4248,0000 返回2为双字长。值为42480000（HEX)=50.0(REAL)"其中“值为42480000（HEX)=50.0(REAL)是怎么算的？
答：实数也称单精度数 符号位1位，阶码8位，尾数23位
第一步,化为2进制
第二步:因为IEEE754使用1个符号,8个阶码,23个尾数,
第三步:根据公式写出实际数值大小
二：基础知识扩展
-----------------------------------------------------------------------
值 存储为 指数偏移量
real*4 1位符号位(s)、8位指数(e)，23位尾数(m,共32位) 127(7FH)
real*8 1位符号位(s)、11位指数(e)，52位尾数(m,共64位) 1023(3FFH)
real*10 1位符号位(s)、15位指数(e)，64位尾数(m,共80位) 16383(3FFFH)
-----------------------------------------------------------------------
符号位1位，阶码8位，尾数23位
30.0
十进制30.0转换成二进制
11110.0
规格化二进制数
1.1110*2^4
计算指数
4+127=131
符号位 指数部分 尾数部分
0 10000011 11100000000000000000000
以单精度（real*4）浮点格式存储该数
0100 0001 1111 0000 0000 0000 0000 0000
4 1 F 0 0 0 0 0
十六进制表达式为41F0 0000H
50.0
十进制50.0转换成二进制
110010.0
规格化二进制数
1.10010*2^5
计算指数
5+127=132
符号位 指数部分 尾数部分
0 10000100 10010000000000000000000
以单精度（real*4）浮点格式存储该数
0100 0010 0100 1000 0000 0000 0000 0000
4 2 4 8 0 0 0 0
十六进制表达式为4248 0000H
问题补充：
DW#16#42480000用2进制表示是0100 0010 0100 1000 0000 0000 0000 0000.
根据IEEE(32)REAL的定义你可以手动进行计算把这些2进制转为REAL=[1+(2的22次方+2的19次方)*2的（-23）次方]*2的(132-127)次方=50.0
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Cisco 3560 Series PoE-24 Switch WS-C3560-24PS-S V07
Cisco 1941-SEC/K9 Gigabit Router CISCO1941-SEC/K9 15.3 IOS - 1 Year Warranty
Cisco Approved ASA5510-MEM-1GB - 1gb DRAM Memory for Cisco ASA 5510
B0108161 SWITCH CISCO SG500-52 52-PORT GIGABIT STAC [SG500-52-K9-G5]
CISCO UNIFIED IP PHONE 7841 CP-7841-K9 4 LINE CHARCOAL NEW IN BOX
CISCO WS-C3560G-48TS-S 15.0 IOS Gigabit Switch 3560G ipservicesk9 w/ Warranty
CISCO WS-C3560G-48TS-S 15.0 IOS Gigabit Switch 3560G ipservicesk9 w/ipservicesk9
CISCO 3560G WS-C3560G-24PS-S 24 PORT 10/100/1000 POE + 4 SFP L3 IP SVCS MINT
NEW CISCO WS-C3850-48U-E w/ C3850-NM-4-1G - NIB Factory Sealed in Box 3850
Cisco Systems Catalyst 2960 Series WS-C2960-8TC-L V01 Switch
PVDM4-64
Lot of (5) Cisco AIR-LAP1142N-A-K9 W/BRACKETS
B0098555 SWITCH CISCO IE 3000 SWITCH 4 10/100 [IE-3000-4TC]
B0573800 SWITCH CISCO SMB 16X GE SG 110-16-EU SNMP [SG110-16-EU]
CISCO ISR 4321 4331 4351 4431 4451-X NIM-ES2-4 4 PORT 10/100/1000 MODULE MINT
B0517895 SWITCH CISCO CATALYST 3560-CX 12 PORTE DATA IP BASE [WS-C3560CX-12TC-S]
B0471969 STAFFE CISCO RACK KIT ACS-2900-RM-19 [ACS-2900-RM-19]
WS-C2960G-24TC-L Cisco Catalyst 2960 24 10/100/1000, 4 T/SFP LAN
CISCO DS-SFP-FC-2G-LW X 4
Cisco VWIC3-2MFT-T1/E1 2-Port WAN/Voice Module
Cisco C3KX-NM-10G **Sealed Genuine Box
Cisco Catalyst (WS-C3750X-48PF-S) 48-Ports-Ports Rack-Mountable Switch Managed
Cisco WS-C3560-48PS-S V07 Layer 3 Switch
Cisco Catalyst WS-X4648-RJ45V+E Gigabit PoE 48-Port Switch Module 4500-E Series
Cisco Systems Catalyst 7500 Router 10/100 Fast Ethernet Module Card 73-1688-04
CISCO Catalyst 3750 Series PeE-48 Stackable Switch WS-C3750-48PS-S V05
2 x new sealed Cisco ASA5505 ASA 5505 SEC-BUN-K9 , UL users, Unrestricted DMZ
NME-CUE ~ Cisco Unity Express Network Module
Cisco 2911-SEC/K9 - Security Bundle Router W/SecurityK9 License CISCO2911-SEC/K9
Cisco WS-C3850-24P-E IP Services Catalyst 24-Port PoE+ Gigabit Switch w/ AC PWR
Cisco Catalyst 2960 Series WS-C2960-24TT-L V02 24 port Switch
Cisco WS-C3750G-24PS-S Switch w/ 2 Bad Ports 90 Day Warranty QTY Available
Cisco Catalyst (WS-C2960-48TC-L) 48-Ports 10/100 Rack-Mountable Managed Switch
Cisco 2516-DC Router 10MB/s IEEE 802.3 14xRJ45 LAN Full-duplex 2516 8MB HUB NEU
Cisco 2911/K9 Router 3-Port GE 4-EHWIC 2-DSP 1-SM 512D/256CF CISCO2911/K9
CISCO WS-C2960G-24TC-L 20 Ethernet 10/100/1000 ports Catalyst Switch 2960G 24
CISCO IAD 2400 SERIES ROUTER
CISCO NEW WS-C3850-24U-S 1 YEAR WARRANTY
NIM-4MFT-T1/E1 ~4 port Multi-flex Trunk Voice T1/E1 Module
New SFP-10G-SR for Cisco SFP+ Transceiver Module 10Gbase-SR 300Meter 850nm
Cisco 16-2647-04 64MB Compact Flash Memory With IOS For 2800 series 2851 Router
LOT OF 10 Cisco IP Phone 7900 Series VoIP CP-7961G Office Telephones
Cisco SPA303G - 3-Line IP Phone
Cisco Catalyst 2950 - WS-C2950-24G- 12-Port External Switch Managed
Cisco UCS UCSB-MLOM-40G-01 VIC 1240 M4 blade
*LOT OF 3*CATALYST 6500 XENPAK BLANL COVER FOR WS-X6704-1 P/N: WS-F6K-XENBLNKCVR
Cisco AIR-RM3000AC-A-K9 Wave Module 60 DAY WARRANTY
Cisco 3845 Router 256MB RAM 64MB Flash inkl. 2x PSU RACK MOUNT
Cisco Catalyst 2950 series WS-C2950G-24-EI 24 port ethernet switch
Cisco Systems MEM3800-64CF incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems MEM-C6K-CPTFL256M incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems MEM3800-256CF incl 19% VAT // 2 years IT4Trade warranty
Cisco AIM-VPN/HPII-PLUS Encryption/Compression CISCO3845 DES/3DES/AES 73-9306 AK
Cisco 4440 AIR-WLC4402-25-K9 Wireless LAN Controller
Cisco CCNA 3 X Catalyst 2950, 4 X 1000Base-SX GBIC Lab Kit
Cisco ASA 5505 Adaptive Security Appliance Firewall
Cisco MDS 9000 Family 1/2/4/8-Gbps 24-Port FC Module DS-X9224-96K9
Cisco WS-X6904-40G-2T 4 Port CFP 40 Gigabit Ethernet Fiber Mod WS-F6K-DFC4-E KK
CISCO AIR-LAP1262N-A-K9 AIRONET 1262N WIRELESS 802.11A/G/N
CISCO WS-C2960S-48TS-S C2960S 48-PORT (We buy and sell Cisco)
CP-BATT-7921G-EXT
CISCO WIC-1T 1-PORT SERIAL WAN INTERFACE CARD
CISCO3845 Cisco Intergrated Service Router
Cisco CP-9971-CL-K9 IP Phone ()
Cisco AIR-CAP2602I-E-K9 Wireless Access Point - 802.11n - Korea Config CleanAir
CISCO PWR-C1-1100WAC Power supply (We buy and sell Cisco)
Cisco ATM 1A-T3 2- ATM Module
Cisco WS-X4506-GB-T 4500 6-Port 10/100/1000 PoE or SFP
Cisco HWIC-1FE High Speed Wan Interface Card (open box)
CISCO SFP-H10GB-CU3M 10GBASE-CU Twin-Ax SFP+
Cisco NM-2W Network Module
CISCO ONS 15454-G1K-4 SONET SHD WOTRBTZBAA
CISCO 440W DC Power Supply Spare PWR-C1-440WDC VO1 Artesyn AA25970 unit l-b art
Cisco PoE Injector - 120 V AC AC Input - 30 W
Switch Ethernet CISCO SF300-08 8 Ports MANADGEABLE RACKABLE NEUF !
Cisco WS-C6504-E Switch Chassis Only! (No fan / No Power)
Cisco Meraki MS220-48 48 Port Networking Switch (Unclaimed)
Cisco Catalyst 48 Port Switch
Cisco Daughter Card WS-F6700-DFC3B V03
Cisco WS-X4920-GB-RJ45 Catalyst 4900M
Cisco CE-550 550 Cache engine, 2 SLOT DRIVE, 2X ETHERNET, 1X SCSI LVD PORTS
Cisco IPS 4255 4200 Series Intrusion Prevention Series Sensor
CISCO HWIC 1T
Cisco WS-C3560E-48TD-S 48 Port Gigabit Ethernet Switch
Cisco 15454-EIA-1BNCB48-NOB
Cisco 12000-SIP-501 Interface Processor
Cisco Catalyst 3500 Series XL 24-Port 10/100 Fast Ethernet Switch WS-C3524-XL-EN
Cisco 1800 Series Router with 32MB Flash Card
CISCO SYSTEMS 1700 SERIES 1760 ROUTER WITH 1MFT-E1 INTERFACE CARD & TESTED
Cisco 7200 Series VXR, 7206VXR Dual Power Supplies
Cisco CP-7970G IP Phone with Color Touch Display ***FREE SHIPPING***
Cisco WS-C3524-PWR-XL-EN 24 Port Switch
RV130W-E-K9-G5 sealed qty. available
New Cisco CP-8845-K9
Cisco CP-7916 Refurbished
Cisco CP-Handset with curly cords Lot of 25
Cisco CP-7962G Refurbished
Cisco CP-7911 IP Phone Replacment Faceplate/ Bezel
New Cisco CP-7926G
Cisco CP-7941G-GE Refurbished
Cisco CP-7965G Refurbished
Cisco CP-7960G Refurbished
Cisco Catalyst 2900 series WS-C2924M-XL-EN 24-Port Ethernet Switch
NEW IN BOX CISCO WS-C3560X-24T-L CATALYST GIGABIT ETHERNET SWITCH **SHIP FAST**
Cisco ONT 1031 - Media converter - 10Base-T, 1000Base-LX, 100Base-TX, 1000Base-T
Genuine Cisco GLC-SX-MMD 10-2626-01 1000Base SX SFP Transceiver Modules
Cisco 2951 ISR G2 CISCO2951/K9 2901 2911 2921
Cisco Catalyst 3750 24 Port Networking Switch (WS-C3750G-24TS-S)
2 X CISCO WS-C2960-8TC-L SWITCHES
CISCO WS-C2960-8TC-L SWITCH LAB SWITCH
CISCO WS-C2960-8TC-S SWITCH LAB SWITCH
NEW IN BOX CISCO WS-X4624-SFP-E 4500E 24-Port Catalyst Switch Module *SHIP FAST*
Sealed New sealed Cisco ASA5505 ASA 5505 SEC-BUN-K9 , UL users, Unrestricted DMZ
Cisco ASA 5505 Appliance with SW, UL Users, 8 port
Cisco Catalyst 3750 24 Port Networking Switch (WS-C3750G-24T-S)
Cisco GigaStack GBIC WS-X3500-XL
CISCO WS-C6509-E-FAN Catalys Chassis Fan Tray - t 6509-E
Sealed New sealed Cisco ASA5505 ASA 5505 SEC-BUN-K9 , UL users, Unrestricted DMZ
3 Cisco 4Gbps Fiber Channel SW SFP DS-SFP-FC4G-LW Transceiver
Cisco Router 1941/K9 with 2 x EHWIC-VA-DSL-A cards
5 x new sealed Cisco ASA5505 ASA 5505 SEC-BUN-K9 , UL users, Unrestricted DMZ
HP Cisco 368285-001 371098-001 BladeSystem GESM Gigabit Ethernet Switch Module
Cisco 1000Base-T GBIC WS-G5483=
GENUINE CISCO GLC-ZX-SM 10-1837-01 MODULE CLASS 1, 21CFR1040.10 SFP TRANSCEIVER
CISCO 2960 x2 + CISCO ASA5500, CISCO JOB LOT x3
New in box SG92-24 24 ports Small business Switch 90 Series Unmanaged Switches
19" Rackmount brackets for 1U Cisco Catalyst switches RCKMNT-1RU,
Cisco SF200-48 SLM248GT 48-Port 10/100 Smart Switch
CISCO X2-10GB-SR Transceiver Originale
Cisco 1841 Integrated Services Router
Proxicast 3G/4G/LTE 3-5 dBi Omni-Directional Universal Blade Antenna for Cisco,
CISCO 1812 ROUTER
CISCO 1921 NUOVO con HWIC1T
CISCO NEW SEALED WS-C2960X-24PD-L 1 YEAR WARRANTY
Cisco CP-9971-C-K9 Unified IP Phone VoIP 9971
Cisco 7961G Six Line Unified VOIP IP Phone, CP-7961G
Cisco 7942 CP-7942G IP Phones with Stand and Handset
Cisco CP-7941G 7941 IP Phone SCCP
Black Phone Case for the Cisco 7921G Phone: CP-CASE-7921G
Cisco CISCO2901/K9 V04 Integrated Services Router 2900 Series Gigabit Wired KMJ
CISCO 2960-24pc-l
Cisco ATA186-I2 price w/o VAT
CISCO Catalyst WS-C3508G-XL-EN 8-Port Gigabit (GBIC) Switch
Loet of 8 Cisco WS-SVC-WISM-1-K9 Wireless Controllers
Cisco WAE-512-K9 WAE 500 Series Wide Area Application Engine
Cisco 11500 - CSS11501 G0 Content Services Switches incl. 2GB CF memory.
Cisco 1000Base-SX SFP Transceiver Module GLC-SX-MM 30-1301-02 ( Cisco Genuine )
CISCO CATALYST WS-C3750X-24P-S 24 PORTS RACK MOUNTABLE SWITCH 3KX- NM-1G
New Genuine Cisco DWDM-Xenpak-50.92 Transceiver 10GBase 1550.92nm 100GHz
WS-X4424-GB-RJ45 Cisco 4500 24-por10/100/1000
CISCO 1941 CISCO1941/K9 INTEGRATED SERVICES ROUTER V05
CISCO2801 Cisco 2801 Router K9
NPE-G1 CISCO 7200NetworProcessingEngi
WS-C3560-24P-S Cisco Catalyst 3560 24 10/100 POE +
WS-C3750-24TS-S Cisco Catalyst 3750 24 10/100
WS-C3560-48TS-S Cisco Catalyst 3560 48 Port
CISCO AIR-AP1242AG-E-K9 UNIT ONLY - AIRONET 1242 WIRELESS ACCESS POINT
**NEW** Cisco UCS VGA DB9 RS232 USB Dongle Cable Adapter 37-1016-01 REV A0
HP Cisco Reactivity Server AH837C, 2 x AH837C Xeon Processors, 4GB RAM
WS-C2960S-48TD-L 2960S 48 GigE, 2 x 10G SFP+ Cisco Catalyst Switch
Cisco SFS7000 4x InfiniBand Switch Module IBM BladeCenter 32R1759
Cisco WS-C2950G-48-EI 48-Port Ethernet Switch
Cisco Catalyst (WS-C3750X-48P-S) 48-Ports-Ports Rack-Mountable Switch...
Cisco Catalyst WS-C3750V2-24ps-S PoE Switch C3750V2-24PS-S 24-port
Cisco PA-MC-2T3+ Multichannel 2T3+ for 7204 7206 VXR Router
Cisco Erweiterungsmodul 4OC3X/POS-IR-LC-B ( 12008, 12012, 12016, 12404 )
Cisco Erweiterungsmodul 4OC48X/POS-SR-SC ( 12008, 12012, 12016, 12404 )
lot of 6pcs WS-C2960C-12PC-L CISCO COMPACT 12PT POE 10/100+2PT 1000/SFP
Linksys / Cisco SR224 (version 2) 24-Port 10/100 Ethernet Switch
GENUINE CISCO EHWIC-D-8ESG-P 8 PORT ETHERNET
CISCO Catalyst 2960 WS-C2960-8TC-L 8-PORT
NEW Cisco SRW224G4-K9-NA SF300-24 Layer 3 Switch 24PT 10 100 4-PT 1000
Cisco ASA5510-SEC-BUN-K9 FIREWALL SECURITY APPLIANCE 1GB RAM, VAT Included
NEW IN BOX CISCO WS-C3560X-24T-S CATALYST 24 PORT ETHERNET SWITCH **SHIP FAST**
CISCO 2950 x12 + CISCO 3700 + CISCO 2600, CISCO JOB LOT x14
NEW Cisco ACS-4430-RM-19= 19-inch Rack Mount Kit for ISR 4430 19in ACS4430RM19
NEW Cisco AIR-ACC1530-CVR= AP1532 Solar Shield Cover Protective and
NEW Cisco CP-HANDSET-CORD= Spare Phone Handset Cord Network Cable cord for 7900
NEW SRW224G4-K9-NA SF300-24 Layer 3 Switch 24PT 10 100 4-PT 1000 Cisco