北京6SE6440-2UD27-5CA1

北京6SE6440-2UD27-5CA1 北京6SE6440-2UD27-5CA1 北京6SE6440-2UD27-5CA1

倍德立（厦门）科技有限公司  

销售经理：杨帆 联系电话：13358371730 座机：0592-6085900  QQ: 2921696645  

销售经理：叶青 联系电话：15359890861 座机：0592-6087118  QQ: 2650907184  

优势品牌：

Siemens（西门子）: 

● 西门子S7-200CN、S7-200SMART、ET200、 S7-300 、S7-400 、6AV、6G系列备件.

● HMI 触摸屏TD200、TD400C、TP177、MP277、MP377、SMART700 、SMART1000.

● MM系列变频器、电源模块、1200模块、触摸屏、1500模块、smart模块.

● 西门子电线电缆、DP接头 、网线网卡等附件.

AB（罗克韦尔）:1734/1746/ 1747/ 1756/1762系列， 承接AB罗克韦尔全系列PLC 变频器、触摸屏、软启动、伺服等业务.

Schneider（施耐德）:PLC控制器、140处理器、输入输出模块、电源模块、变频器低压配件等。

P+F倍加福、Phoenix菲尼克斯、IFM易福门、Beckhoff倍福等进口品牌.

6GK5206-2BS00-2AC2 

FBT52U0HP 

6ES7315-2EH14-0AB0

3RU6116-1BB1

3RU6116-0HB1

3UG4512-1BR20 

6SL3040-0MA00-0AA1

6SL3040-1MA00-0AA0

1756-IB16

1756-TBNH 

1756-N2  

3NP1133-1CA20 

3NP1133-1CA20 

ATV310HU15N4A 

AL2-24MR-D 

FR-F840-00023-2-60  

FZ1500R33HE3 

1SP0635V2M1-33

2198-ABQE

7MH4138-6AA000-0BA0 

6AV3607-1JC20-0AX1

DRP-240-24 

7KM4211-1BA00-3AA0

7KM9300-0AB01-0AA0

6FC5372-0AA30-0AB0 

6SL3120-1TE13-0AD0

6SL3330-6TE41-1AA3 

6ES7314-1AG13-0AB0 

288-1SR30-0AA0  

288-2DR08-0AA0  

288-3AR04-0AA0 

6ES7522-1BL10-0AA0 

6ES7155-5AA01-0AB0

6ES7590-1AF30-0AA0

IC695PSD040  

EPSCPE100 

IC694MDL260

IC694MDL340  

ACS510-01-038A-4+B055

188J2C100

2711R-T10T 

1766-L32BXBA 

1762-OW16 

1762-OF4

6GK5766-1GE00-3DA0 

140CPU67160

4NC5325-0CE21

6SL3203-0BB21-8VA0

7MH4930-0AA01 

6ES7650-8AT60-0AA0 

6ES7650-8BT60-0AA0

3UF7300-1AU00-0

3UF7010-1AU00-0

3UF7941-0AA00-0

6FX2001-5QN25

6FX2001-6RB01-4GA0 

407-0KA00-0AA0 

417-5HT06-0AB0

443-1EX30-0XE0 

6AV3607-1JC20-0AX0

6ES7400-2JA00-0AA0

IC693CPU350 

IC693MDL940F

IC693CHS391

ATV320U55N4C

20-750-UFB-1 

6FC5372-0AA30-0AA0 

6GK7242-5DX30-0XE0

6ES7332-5HB01-0AB0

TM218LDA40DRN 

6ES7235-0KD22-0XA8 

6ES7313-6CF03-0AB0

6SE6440-2UD27-5CA1 

6SL3320-1TG28-5AA3 

IC693CPU374

TM218LDA40DRN 

6ES7235-0KD22-0XA8

6ES7313-6CF03-0AB0

6SE6440-2UD27-5CA1

6SL3320-1TG28-5AA3

315-2AG10-0AB0

6ES7211-1AE40-0XB0

6ES7212-1BE31-0XB0

6ES7214-1DB20-0XB0

6ES7214-1HG40-0XB0

6ES7215-1HG40-0XB0

6ES7314-1AF11-0AB0

6ES7314-6CH04-0AB0

6ES7315-2AG10-0AB0

6ES7315-2AH14-0AB0

6ES7317-2AJ10-0AB0

6ES7513-1AL01-0AB0

6ES7515-2FM01-0AB0 

6ES7635-2EC01-0AE3

6ES7635-2EC02-0AE3

6ES7214 1AD23-0XB0

6ES7214-1HG40-0XB0

6ES7315-2EH14-0AB0

6ES7317-2AK14-0AB0

6GK74431EX110XE0

6ES7515-2AM01-0AB0

6ES7635-2EC02-0AE3 

6ES7214-1AG40-0XB0

EGX150

S801+T18N3S    

6SL3201-0BE14-3AA0 

22C-D030N103  

1770-CD 

1756-OF8H  

6SN1123-1AA00-0EA2

6SN1123-1AB00-0BA1

6SN1118-0DM33-0AA2 

BMXAMI0800

BMXDDI3202K

6DL1193-6BH00-0RM0 

6DL1155-6AU00-0PM0  

6DL1193-6AR00-0AA0 

6DL1131-6BL00-0PH1  

6DL1132-6BL00-0PH1 

6DL1132-6BL00-0PH1 

6DL1135-6TF00-0PH1 

6DL1193-6TP00-0DH1 

6DL1193-6GA00-0NN0 

LT3SM00M 

ACS880-01-087A-3+D150 

WT260-P260

A20B-2101-0354

6SL3210-1PE31-8UL0   

6SL3246-0BA22-1FA0  

6SL3255-0AA00-4CA1  

6ES7307-1EA01-0AA0 

6ES7315-2EH14-0AB0 

SB822

6SN1123-1AB00-0CA3   

VFD2A7MS43ANSAA

NDR-240-24

GS2107-WTBD 

FX3U-128M

FX2N-16EX

GT01-C30R4-8P

FX3U-1PG

FX3U-16CCL-M

FX3U-ENET-L

LY2N-D2 DC24V

PTF08-A

FR-BU2-3.7k 

M2QA132M8-SDA 

ASD-A2-1021-L 

ASD-A2-3043-M 

VFD110B43A 

VFD075V43A-2

CJ1W-OD231 

TM3AI8 

5069-AENTR  

6RA8031-6DV62-0AA0

6DL1193-6BH00-0RM0 

6DL1155-6AU00-0PM0 

6DL1132-6BL00-0PH1 

6DL1135-6TF00-0PH1

6DL1193-6TP00-0DH1

6DL1193-6GA00-0NN0

6DL1193-6MC00-0AA0

3RT2026-1BB40-0CC0 

3RT2023-1BB40-0CC0

ATV310HU15N4A  

3RV2431-4WA10 

3RV2431-4WA10 

443-1EX30-0XEO 

1769-L30ER 

SRB-NA-R-C.21-24V

6ES7331-7KF02-0AB0

A06B-6079-H401

938723Q 

1747-L542 

1756-L71   

1747-L541

197-1LB00-0XA0  

6FC5303-0AF22-1AA1 

QJ71C24N-R2 

QJ71MB91  

A5E00680725 

6FC5372-0AA30-0AB0 

6ES7635-2EC01-0AE3  

6SL3120-1TE23-0AA3 

513-1AL01-0AB0 

BMXAMI0800 

BMXDDI3202K 

193-4CB30-0AA0 

PP865A  

643-0CD01-1AX1 

3AUA0000036521 

RDCU-12C

NDCU-33C

350-2AH01-0AE0 

516-3AN00-0AB0

6GK1901-1BB10-2AB0

1734-IE2C

1734-TBCJC

1734-AENTR 

5069-AENTR

120-2TE21-8AA3 

IC697PWR711K  

IC200ALG328J

100-C85A00 

1756-OF8H  

CP-8551  SIEBE 

FX1S-10MR-001

FX1S-14MR-001

FX1S-20MR-001

FX1S-30MR-001

FX1S-10MT-001

FX1S-14MT-001

FX1S-20MT-001

FX1S-30MT-001

FX3SA-10MR-CM

FX3SA-14MR-CM

FX3SA-20MR-CM

FX3SA-30MR-CM

FX3SA-10MT-CM

FX3SA-14MT-CM

FX3SA-20MT-CM

FX3SA-30MT-CM

FX3U-16MR-ES-A

FX3U-32MR-ES-A

FX3U-48MR-ES-A

FX3U-64MR-ES-A

FX3U-80MR-ES-A

FX3U-128MR-ES-A

FX3U-16MT-ES-A

FX3U-32MT-ES-A

FX3U-48MT-ES-A

FX3U-64MT-ES-A

FX3U-80MT-ES-A

FX3U-128MT-ES-A

FX3G-14MR/ES

FX3G-24MR/ES

FX3G-40MR/ES

FX3G-60MR/ES

FX3G-14MT/ES-A

FX3G-24MT/ES-A

FX3G-40MT/ES-A

FX3G-60MT/ES-A

FX3G-5DM

FX3GA-24MR-CM

FX3GA-40MR-CM

FX3GA-60MR-CM

FX3GA-24MT-CM

FX3GA-40MT-CM

FX3GA-60MT-CM

FX1N-14MR-001

FX1N-24MR-001

FX1N-40MR-001

FX1N-60MR-001

FX2N-16MR-001

FX2N-32MR-001

FX2N-48MR-001

FX2N-64MR-001

FX2N-80MR-001

FX2N-128MR-001

FX1N-14MT-001

FX1N-24MT-001

FX1N-40MT-001

FX1N-60MT-001

FX2N-16MT-001

FX2N-32MT-001

FX2N-48MT-001

FX2N-64MT-001

FX2N-80MT-001

FX2N-128MT-001

FX0N-40ER

FX0N-40ET

FXON-32NT-DP

FX0N-3A

FX0N-30EC

FX0N-65EC

FX-USB-AW

FX2N-ROM-E1

FX1N-1DA-BD

FX1N-2AD-BD

FX3G-2AD-BD 

FX1N-2EYT-BD

FX1N-4EX-BD

FX1N-8AV-BD

FX1N-232-BD

FX1N-422-BD

FX1N-485-BD

FX1N-485-BD

FX1N-CNV-BD

FX1N-EEPROM-8L

FX-EEPROM-8

FX-EEPROM-16

FX2N-48ER

FX2N-48ET

FX2N-32ER

FX2N-32ET

FX2N-16EX 

FX2N-16EYR

FX2N-16EYT

FX2N-8ER/8EYR/8EYT

FX2N-8EX

FX2N-2AD

FX2N-2DA

FX2N-4AD

FX2N-4DA

FX2N-4AD-TC

FX2N-4AD-PT

FX2N-2LC

FX2N-5A

FX2N-8AD

FX2N-1PG

FX3U-1PG

FX2N-10GM

FX2N-10PG

FX2N-20GM

E-20TP-E-SETO

FX-20P-E-SETO

FX-30P

FX2N-1RM-E-SETO

FX2N-16CCL-M

FX3U-16CCL-M

FX2N-16LINK-M

FX2N-32CCL

FX2N-232IF

FX2N-CNV-IF

FX2N-8AV-BD

FX2N-232-BD

FX2N-422-BD

FX2N-485-BD

FX2N-CNV-BC

FX2N-CNV-BD

FX3U-232-BD

FX3U-422-BD

FX3U-485-BD

FX3U-CNV-BD

FX3U-USB-BD

FX3U-4AD-PT-ADP 

FX3U-4AD-TC-ADP

FX3U-4AD-ADP

FX3U-4DA-ADP  

FX3U-4AD

FX3U-4DA

FX3U-232ADP

FX3U-485-ADP-MB 

FX3U-3A-ADP

FX3U-7DM

FX3U-2HSY-ADP 

FX3U-4HSX-ADP 

FX3U-1PSU-5V

FX3U-20SSC-H  

FX3U-2HC 

FX3U-ENET-L  

FX3U-ENET-ADP

FX3U-FLROM-16

FX3U-FLROM-64

FX3U-FLROM-64L

FX3G-1DA-BD

FX3G-232-BD

FX3G-2AD-BD

FX3G-422-BD

FX3G-485-BD

FX3G-8AV-BD

FX3G-CNV-ADP

FX3G-EEPROM-32L

FX3U-32BL 

FX-485PC-IF

FX1NC-16MT

FX1NC-32MT 

FX2NC-16MR-T

FX2NC-16MT

FX2NC-32MT

FX2NC-64MT

FX2NC-96MT

FX2NC-32EX

FX2NC-32EYT

FX2NC-16EX

FX2NC-16EYT

FX2NC-16EX-T

FX2NC-16EYR-T

FX2NC-232-ADP

FX2NC-485-ADP

FX2NC-CNV-IF

FX2NC-EEPROM-16

FX2NC-EEPROM-16C

FX2NC-32EX-DS

FX3U-48MT-DS

FX3U-80MT-DS

FX3UC-32MT-LT

FX3UC-16MT/D

FX3UC-32MT/D

FX3UC-64MT/D

FX3UC-96MT/D

FX3UC-64MT/DSS

FX3UC-96MT/DSS

FX3U-64CCL

FX1S-14MR-ES/UL

FX1S-20MR-ES/UL

FX1S-30MR-ES/UL

FX1N-24MR-ES/UL

FX1N-40MR-ES/UL

FX1N-60MR-ES/UL

FX2N-32MR-ES/UL

FX2N-48MR-ES/UL

FX2N-64MR-ES/UL

FX2N-80MR-ES/UL

FX2N-128MR-ES/UL

FX1S-10MR-D

FX1S-14MR-D

FX1S-20MR-D

FX1S-30MR-D

FX1N-24MR-D

FX1N-40MR-D

FX1N-60MR-D

FX2N-32MR-D

FX2N-48MR-D

FX2N-80MR-D

FX2N-64MR-D

FX1S-10MT-D

FX1S-14MT-D

FX1S-20MT-D

FX1S-30MT-D

FX1N-24MT-D

FX1N-40MT-D

FX1N-60MT-D

FX2N-32MT-D

FX2N-48MT-D

FX2N-64MT-D

FX2N-80MT-D

FX-16E-150CAB    

FX-16E-TB       

FX-32E-TB  

MR-J4-10A

MR-J4-20A

MR-J4-40A

MR-J4-60A

MR-J4-70A

MR-J4-100A

MR-J4-200A

MR-J4-350A

MR-J4-500A

MR-J4-700A

MR-J4-10B

MR-J4-20B

MR-J4-40B

MR-J4-60B

MR-J4-70B

MR-J4-100B

MR-J4-200B

MR-J4-350B

MR-J4-500B

MR-J4-700B

MR-J4W2-22B

MR-J4W2-44B

MR-J4W2-77B

MR-J4W2-1010B

MR-J4W3-222B

MR-J4W3-444B

HG-KR053

HG-KR13J

HG-KR23J

HG-KR43J

HG-KR73J

HG-KR053BJ

HG-KR13BJ

HG-KR23BJ

HG-KR43BJ

HG-KR73BJ

HG-MR053

HG-MR13

HG-MR23

HG-MR43

HG-MR73

HG-MR053B

HG-MR13B

HG-MR23B

HG-MR43B

HG-MR73B

HG-SR52J

HG-SR102J

HG-SR152J

HG-SR202J

HG-SR352J

HG-SR502J

HG-SR702J

HG-SR52BJ

HG-SR102BJ

HG-SR152BJ

HG-SR202BJ

HG-SR352BJ

HG-SR502BJ

HG-SR702BJ

MR-ENCNS2

MR-ENCNS2A

MR-BKCNS2

MR-BKCNS2A

MR-J4FCCBL03M

MR-BAT6V1SET

MR-BAT6V1

MR-BT6VCASE

MR-BT6V1CBL03M

MR-BT6V1CBL1M

MR-BT6V2CBL03M

MR-BT6V2CBL1M

MR-RB3N

MR-RB5N

Q172DSCPU

Q173DSCPU

Q171ENC-W8

Q170ENCCBL2M-A

Q170ENCCBL5M-A

Q170ENCCBL10M-A

Q170ENCCBL20M-A

Q170ENCCBL30M-A

Q170ENCCBL50M-A

SW8DNC-SV1322QJLSET

QD77MS2

QD77MS4

QD77MS16

MR-JE-10A/B 

HG-KN13J-S100 

MR-J3ENCBL5M-A1-L 

MR-PWS1CBL5M-A1-L

MR-J3CN1

FR-ABR-H0.4K

FR-ABR-H0.75K

FR-ABR-H1.5K

FR-ABR-H2.2K

FR-ABR-H3.7K

FR-ABR-H5.5K

FR-ABR-H7.5K

FR-ABR-H11K

FR-ABR-H15K

FR-ABR-H22K

FR-BU2-H7.5K

FR-BU2-H15K

FR-BU2-H30K

FR-BU2-H55K

FR-BU2-H75K

FR-BR-H15K 

FR-BR-H30K

FR-BR-H55K 

FR-BR-H75K 

FR-HEL-H0.4K

FR-HEL-H0.75K

FR-HEL-H1.5K

FR-HEL-H2.2K

FR-HEL-H3.7K

FR-HEL-H5.5K

FR-HEL-H7.5K

FR-HEL-H11K

FR-HEL-H15K

FR-HEL-H18.5K

FR-HEL-H22K

FR-HEL-H30K

FR-HEL-H37K

FR-HEL-H45K

FR-HEL-H55K

FR-E5P

FR-ABR-0.4K

FR-ABR-0.75K

FR-ABR-1.5K

FR-ABR-2.2K

FR-ABR-3.7K

FR-ABR-5.5K

FR-HEL-0.4K

FR-HEL-0.75K

FR-HEL-3.7K

FR-HEL-5.5K

FR-A740-0.4K

FR-A740-0.75K

FR-A740-1.5K

FR-A740-2.2K

FR-A740-3.7K

FR-A740-5.5K

FR-A740-7.5K

FR-A740-11K

FR-A740-15K

FR-A740-18.5K

FR-A740-22K

FR-A740-30K

FR-A740-37K

FR-F740-0.75K

FR-F740-1.5K

FR-F740-2.2K

FR-F740-3.7K

FR-F740-5.5K

FR-F740-7.5K

FR-F740-11K

FR-F740-15K

FR-F740-18.5K

FR-F740-22K

FR-F740-30K

FR-F740-37K

FR-E740-0.4K

FR-E740-0.75K

FR-E740-1.5K

FR-E740-2.2K

FR-E740-3.7K

FR-E740-5.5K

FR-E740-7.5K

FR-E740-11K

FR-E740-15K

FR-D740-0.4K

FR-D740-0.75K

FR-D740-1.5K

FR-D740-2.2K

FR-D740-3.7K

FR-D740-5.5K

FR-D740-7.5K

FR-D720S-0.4K

FR-D720S-0.75K

FR-D720S-1.5K

FR-D720S-2.2K

FR-A720-0.4K

FR-A720-0.75K

FR-A720-1.5K

FR-A720-2.2K

FR-A720-3.7K

FR-A720-5.5K

FR-A720-7.5K

FR-A720-11K

FR-A720-15K

FR-A720-18.5K

FR-A720-22K

FR-A720-30K

FR-A720-37K

FR-A720-45K

FR-A720-55K

FR-A720-75K

FR-A720-90K

FR-F720-0.75K

FR-F720-1.5K

FR-F720-2.2K

FR-F720-3.7K

FR-F720P-5.5K

FR-F720-7.5K

FR-F720-11K

FR-F720-15K

FR-F720-18.5K

FR-F720-22K

FR-F720-30K

FR-F720-37K

FR-F720-45K

FR-F720-55K

FR-F720-75K

FR-F720-90K

FR-F720-110K

FR-E720S-0.4K

FR-E720S-0.75K

FR-E720S-1.5

FR-E720S-2.2

FR-E720-0.1K

FR-E720-0.2K

FR-E720-0.4K

FR-E720-0.75K

FR-E720-1.5K

FR-E720-2.2K

FR-E720-3.7K

FR-E720-5.5K

FR-E720-7.5K

FR-E720-11K

FR-E720-15K

FR-D720-0.1K 

FR-D720-0.2K 

FR-D720-0.4K

FR-D720-0.75K

FR-D720-1.5K

FR-D720-2.2K

FR-D720-3.7K

FR-D720-5.5K

FR-D720-7.5K

FR-PU07

FR-PU04

FR-DU07

FR-DU04

FR-A7AP

FR-A7AR

FR-A7AX

FR-A7AY

FR-A7NC

FR-A7ND

FR-A7NL

FR-A7NS

FR-A7NM

FR-A7NP

FR-A7NP E KIT

FR-PA07

E-KIT 

GT1050-QBBD-C 

GT1030-HBD-C

GS2107-WTBD

GS2110-WTBD

GT1055-QSBD-C

GT1155-QSBD-C 

GT1150-QBBD-C

GT1155-QSBD-C

GT1575-VNBA

GT1675-VNBA

GT1275-VNBA

GT2310-VTBA

GT1275-VNBD

GT2310-VTBD

GT1265-VNBA

GT2308-VTBA

GT1672-VNBA

GT1662-VNBA

GT1662-VNBD  

GT1020-LBL-C

FX1N-5DM

GT1575-STBA

 GT1675M-STBA

GT1575-VTBA

 GT1675M-VTBA 

GT1575-VTBD

GT1675M-VTBD

GT1575-STBD

GT1675M-STBD

GT1585-STBA

 GT1685M-STBA 

GT1585-STBD

GT1685M-STBD

GT1595-XTBA

GT1695M-XTBA

GT1595-XTBD

GT1695M-XTBD

GT1565-VTBA

GT1665M-VTBA 

GT1565-VTBD

GT1665M-VTBD

GT1665M-STBA

GT1665M-STBD

GT1585V-STBA

GT1585V-STBD

GT1575-VNBD

GT1675-VNBD

GT1572-VNBA

GT1672-VNBA  

GT1572-VNBD

GT1572-VNBD

GT1562-VNBD

GT1555-VTBD

GT1555-QTBD

GT1555-QSBD

GT1550-QLBD

GT1155-QSBD

GT1055-QSBD

GT1150-QLBD

GT1150-QLBDQ

GT1155-QTBDQ

GT1155-QSBDQ 

GT1155HS-QSBD

GT1150HS-QLBD

GT1455-QTBDE

GT01-C30R2-9S

GT01-C30R4-8P

GT09-C20USB-5P

GT16-C02R4-9S  

GT09-C100R4-6C 

GT15-RS2T4-9P

GT15-RS4-9S  

GT15-RS4-TE

GT15-J61BT13

GT15-QFNB16M

GT15-QFNB32M

GT15-QFNB

GT15-QBUS

GT15-QC30B:

GT15-ABUS

GT15-QBUS2

GT15-PRN   

GT15-J71E71-100 

GT11H-C100-37P

GT05-MEM-ADPC 

GT05-MEM-128MC

GT05-MEM-256MC

GT05-MEM-512MC

GT05-MEM-1GC

GT05-MEM-2GC

GT15-QC100B  

GT15-75QBUSL

QT15-75ABUSL     

GT15-C100EXSS-1

FX-10DU-E

FX-10DM-E

FX-10DM

GT1030  GT11-50BAT

A970GOT-TBA-B

GT1675M-VTBA

A960GOT-EBD 

A985GOT-TBA

GT1685M-STBA                                

A9GT-QBUSS

GT15-QBUS

F930GOT-BWD-C

A960GOT-EBD

F940WGOT-TWD-C 

F940GOT-SWD-C

F920GOT-BBD-K-C

MR-JE-20A

MR-JE-40A

MR-JE-100A

MR-JE-200A

HG-SN152J-S100

MR-JE-200A

HG-SN202J-S100

MR-JE-300A

MR-JE-300A

MR-JE-10A

MR-JE-70A

MR-JE-200A

MR-J2S-20A/B

MR-J2S-60A

MR-J2S-70A

MR-J2S-100A

MR-J2S-200A

MR-J2S-350A

MR-J2S-500A

MR-J2S-10A

MR-J2S-20A

MR-J2S-40A

MR-J2S-60A

MR-J3-350A

MR-J2S-10A/B

MR-J2S-700A

MR-J3-10A/B

MR-J3-20A

MR-J3-40A

MR-J3-60A

MR-J3-70A

MR-J3-100A

HF-SP102

MR-J3ENSCBL5M-L

MR-PWCNS4

MR-J3CN1

MR-J3SCNS 

HF-SFS81

MR-J3-500A

HF-SP502

MR-J3-700A

HF-SP702

MR-J3-10A

HF-KP13B/MP13B

MR-J3ENCBL5M-A2-L

MR-PWS1CBL5M-A2-L

MR-BKS1CBL5M-A2-L

MR-J3CN1

MR-J3-20A

MR-J3-40A

MR-J3-60A

MR-J3-70A

MR-J3-100A

MR-J3-200A

MR-J3-350A

MR-J3-500A

HF-SP502B

MR-J3-700A

HF-SP702B

MR-J3-200A

HF-SP152B