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CL31F106ZPAE
LP3874ES-3.3
2D SR-510
TDAD3-C02A
PZ-G102N
PR-MB30CN
XMCAB
M81X60S2LGA
STM32L051R8H6
MC13892VL
PI3B32X384BX
PI3EQX6701CZDEX
BL-601 BL-601HA
DV0PM20024
KK3270046
MPC8248CZQMIBA
FD-H35-M2
LCMXO2-1200HC-4MG132C
XC6209B332PRN
XC6373A300PRN


MC9S08LG32CLK
DPL12H2424A24KG
XC6122D329MR-G
BD18GA3MEFJ-ME2
STM32L053R8H6
XC9237B1ECER-G
MC68HC908JL8CSPE2
XC6123E716ER-G
74LV02D
LT10N02SI
TTL-232R-3V3-2MM
PAT0510S-C-9DB-T10
TPS40193DRCR
PT7302WEX
DG401DY-E3
XC95144-15TQ100I
MHMF5AZL1A2
GP-XC10M-P
PI5C3245Q
DP16H2424A20F
MFECA0030EPD
XB5352A
ADSP-2183BST-133
MC34713EP
ADMTV300BCPZRL
F6070-2ERV
33A-005D
74LVC594AD-Q100J
BLF7G10LS-250
M25P05-MN6P
LCMXO640C-3TN144C
XC5101
THC63LVDF84B
SR-1000OP-87225+OP-87231

02561024-000
BA30JC5T
BA33BC0FP-E2
DP11VN15A15K
PI5C32X384CBX
XC9207A196MRN
PI74FCT16374TAE
OV09740-A46A
WLC-300GRS
L128V75TN100-10I
DS3692N
74VHC541BQ
HI6421GFCV610B
PI3HDMI412FT-AZHEX
H97C2051
SR-D100 ,
BL-180W
XB3303A
EPCQ64ASI16N
MS-CX2-2
SPC5645SF1VLU
PI3HDMI412FT-BZHE
BL-U1
AHP2808S
MSME152G1C
MHMF102L1D7
BU4223G-TR
PAT1220-C-4dB-T1
XC9232A33CVR-G
88E1510-A0-NNB2I000
HD6473258P10
MPC8343ZQAGDB
IR21571S
PI4ULS5V202XVEX
HM6267P-35
TLE6230GP
SKM75GAR063D
S3C9234X54-C0
LM76003RNPR
XL1509-5.0
STM32F072C7
K4T51163QI-HCE7
BA033CC0WFP-E2
9CV-3000
MHMD082G1B
XC61FN2842MR-G
ANT5320LL02R2400A
RT8477AGSP
TPS65910A3A1RSLR
MSMF302L1H5
GAL16V8D-15LJ
ASFN44770
XB8886A
THC63LVDM83C
PI3HDMI201ZFE
EAS-8P29SG
SB6213CZU
KV-EP02
FX-551-C2
74AHC126D-Q100
XC6127C19GNR-G
HD6301V1N39F
CV-X250F
DP-102-M
PI7C9X2G304SLAFDEX
SAL-TC212L-8F133NAC
HY5PS1GB31C
KV-RAD
GD32F150C6T6
DP12SH2424A20F
AD876JST
GV-21,GV-22
XC6222C081PR-G
MY9G100B
LT1641-1CS8
LCMXO2-640HC-4TG100I
OV7910
ICL7660SCPA
DP11HN15B15S
H9TKNNN8JDMP
HZM5.6NB2
AL1692L-30B1S7-13
88E6061-A1-LAJ1I000
BD63710AEFV-E2
HY5DV281622DT-5
FS-N1 FS-N14P
Modbus是plc應(yīng)用中常用的通訊手段,輪詢是在進(jìn)行一個(gè)控制器連接多個(gè)從站的通訊時(shí)常用的編程手段,由于ST語言在數(shù)據(jù)處理上的優(yōu)勢,此方法變得更為簡單。下面以西門子S71214CPLC的ModbusRTU通訊為例,展現(xiàn)ST語言下的modbus通訊和輪詢。硬件連接要準(zhǔn)備的硬件和軟件:1.西門子plc1214C;2.通訊板CB1241;3.USB轉(zhuǎn)RS485轉(zhuǎn)換器;4.Modscan2/Modsim32電腦模擬軟件模擬主/從站,5.SPU(serialportUtility),監(jiān)視通訊報(bào)文。