Siemens Simatic S7 Control Systems & PLCs S7/200 Controller Platform

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Industrial Automation & Motion Controls

3,555 Results

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 184.30
or Best Offer
Free shipping
3+7 ^A0 & B*K ]T5 wCG. ?!|/ $S p o n s o r e d
1PCS SIMATIC S7-200 SMART New Brand Free Shipping SIEMENS 6ES7288-1SR60-0AA1
Brand New · Siemens
S$ 465.03
or Best Offer
Free shipping
61 +F^ &* H] w.?!S|5 /64 $S p o n s o r e d
6ES7214-1BD23-0XB0 西门子 CPU 模块全新带盒!Spot Goods GNDM-
Brand New · Siemens
S$ 444.80
Was: S$ 523.29was - S$ 523.29
or Best Offer
Free shipping
+HQ ^ 5I &F*5 ] w PF J.?!|/J $S p o n s o r e d
6ES7 222-1EF22-0XA0 NEW SIEMENS PLC SIMATIC S7-200 EM222 6ES7222-1EF22-0XA0
Brand New · Siemens
S$ 547.61
Was: S$ 644.25was - S$ 644.25
or Best Offer
Free shipping
P+^ &N * ] Yw.?7! XS| DI /OH $S p o n s o r e d
New Siemens 6ES7223-1HF22-0XA0 1 PCS With Good Conditions intact
Brand New · Siemens
S$ 125.69
S$ 28.66 shipping
Only 1 left!
T+^I O&H* ]K 7w. ?!NB| / F$
Siemens Simatic S7-200 6ES72141AD23-0XB0- Guaranteed Working Condition
Pre-Owned · Siemens
S$ 82.65
or Best Offer
S$ 178.53 shipping
+Q4 ^ &2J * ] 5T w.?8G!|/ $
SIEMENS SIMATIC S7-1200 CPU 1214C DC/DC/DC 6ES7 214-1HG40-0XB0
Brand New · Siemens
S$ 286.63
or Best Offer
S$ 46.30 shipping
BD+ ^ &*L ]J w.?!|TS VQ AA/ $
6ES7212-1HE40-0XB0 - S7-1200, CPU 1212C, DC/DC/relay, BRAND NEW- UK STOCK
Brand New · Siemens
S$ 400.90
S$ 45.52 shipping
+^ 4&F* C ]5 2Aw. 9?4 !2|J/ $
New Siemens 6ES7223-1HF22-0XA0 1 PCS With Good Conditions intact
Brand New · Siemens
S$ 125.71
S$ 28.66 shipping
+NL^ &Y* ]Q w.? !SN| / $WP
6ES7 214-2AD23-0XB8 1PC NEW SIEMENS S7-200 CPU 224 6ES7214-2AD23-0XB8 2AD23-0XB8
Brand New · Siemens
S$ 197.40
Was: S$ 207.79was - S$ 207.79
or Best Offer
Free shipping
+^ &*U8 L3 ] Vw.A?! |/ LN$
New Siemens 6ES7223-1BL32-0XB0 S7-1200 Digital I/O SM 1223 6ES7 223-1BL32-0XB0
Brand New · Siemens
S$ 176.36
Was: S$ 185.65was - S$ 185.65
or Best Offer
Free shipping
+C6^ 8 &3* ] Hw.W?! |R/ $0
New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 172.55
or Best Offer
Free shipping
+^ 4T &* ]H N w.?!FM |8/C $
1PC Siemens 6ES7272-0AA30-0YA0 6ES7 272-0AA30-0YA0 S7
Brand New · Siemens
S$ 249.54
or Best Offer
Free shipping
+^K W 30 D&L* ] TwN. ?E!5 |/ $
6ES7314-6EH04-0AB0 New Sealed Siemens SIMATIC S7-300，CPU 6ES 7314-6EH04-0AB0
Brand New · Siemens
S$ 1,774.98
Was: S$ 1,972.20was - S$ 1,972.20
or Best Offer
Free shipping
K1 +^ &1*P ] 45w 20.?!| /I $S p o n s o r e d
New Siemens 6ES7 288-1SR60-0AA1 6ES7288-1SR60-0AA1 SIMATIC S7-200 SMART CPU SR60
Brand New · Siemens
S$ 422.22
or Best Offer
Free shipping
3+S^ 85 &* ] wI.?S! RG|/ $S p o n s o r e d
New Siemens 6ES7288-1ST20-0AA1 6ES72881ST200AA1 SIMATIC S7-200 SMART CPU ST20
Brand New · Siemens
S$ 247.95
or Best Offer
Free shipping
+^C1 UI G0 &* ] wX.?8 6!5|/ $S p o n s o r e d
New Siemens SIMATIC S7-200 SMART CPU CR40 6ES7288-1CR40-0AA0 6ES7 288-1CR40-0AA0
Brand New · Siemens
S$ 149.32
Free shipping
+^ 5U OP& *R ] wP .?T!D|/ $
6ES7 223-1PH22-0XA8 NEW SIEMENS 6ES7223-1PH22-0XA8 Digital Input/Output Module
Brand New · Siemens
S$ 83.94
Was: S$ 98.76was - S$ 98.76
or Best Offer
Free shipping
+^ &62* ]K w.D ?V!E GP |BN/ $
1PC NEW IN BOX Siemens 6ES7214-1BG31-0XB0 6ES7 214-1BG31-0XB0 FAST DELIVERY
Brand New · Siemens
S$ 316.18
or Best Offer
Free shipping
1D+ 8^P W 5 &N*I ] w.? !|Y/R $
6ES7212-1BB23-0XB8 1PCS Unopened New Siemens 6ES7 212-1BB23-0XB8 Fast delivery
Brand New · Siemens
S$ 103.17
or Best Offer
Free shipping
0+^ L& 88* ] w.?!X|N / $FJ
New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0
Brand New · Siemens
S$ 202.75
or Best Offer
Free shipping
B+Z^ & B*R ] PB wOP.?!|/ JJ $
6ES7223-1HF22-0XA0 NEW SIEMENS DIGITAL OUTPUT/INPUT MOUDLES 6ES7223-1HF22-0XA0
Brand New · Siemens
S$ 59.99
Free shipping
9U N0+^ 1 &* ]A w.?!|/ 8$J
New Siemens 6ES7134-4LB02-0AB0 Simatic S7 Analog Electronic Module Unit in Box
Brand New · Siemens
S$ 184.87
or Best Offer
S$ 30.41 shipping
+7^ &* ]N OP X4w.?! |0/8 $
New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 169.51
or Best Offer
Free shipping
+P^ 4 &*Y Q] w 1.P?! S|J/ $
New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0
Brand New · Siemens
S$ 138.77
or Best Offer
Free shipping
+L^N R8& R*T ] w5.2 ?M!L|/ $
New Siemens 6ES7216-2BD23-0XB0 6ES72162BD230XB0 SIMATIC S7-200 CPU 226
Brand New · Siemens
S$ 211.80
or Best Offer
Free shipping
+^ &0*6 A5 H] 8 2w.?!L P9|/ $
1PCS Brand NEW Siemens Simatic PLC 6ES7223-1HF22-0XA0
Brand New · Siemens
S$ 51.85
or Best Offer
Free shipping
+U^ P O2 3&*I ] w I.?!|R/ KY $
1PCS 6ES7223-1BL32-0XB0 for Brand NEW Siemens Simatic S7-1200 with box
Brand New · Siemens
S$ 252.06
Was: S$ 268.15was - S$ 268.15
or Best Offer
Free shipping
Q+J^ &6P* FY] w. B?!1 |8S/ $
New Siemens 6ES7288-1SR20-0AA1 6ES72881SR200AA1 SIMATIC S7-200 SMART CPU SR20
Brand New · Siemens
S$ 222.15
or Best Offer
Free shipping
8+^ C R&* ] w.?!Q|/ K4 UR $S p o n s o r e d
1pc New Siemens 6ES7288-1CR60-0AA0 Central Processing Unit SIMATIC S7-200 CR60
Brand New · Siemens
S$ 416.02
or Best Offer
Free shipping
+^ 3L &T* ] w.T ?C!5 |W7 4/ $S p o n s o r e d
New Siemens 6ES7288-1ST20-0AA1 6ES72881ST200AA1 SIMATIC S7-200 SMART CPU ST20
Brand New · Siemens
S$ 247.95
or Best Offer
Free shipping
EC TA +^Y &* O] w.?!| / GV$ S p o n s o r e d
SIEMENS Simatic S7-200 SMART 6ES7288-1ST30-0AA1 6ES7 288-1ST30-0AA1 CPU module
Brand New · Siemens
S$ 227.65
Was: S$ 267.82was - S$ 267.82
or Best Offer
Free shipping
+3^M &* E ]6 w.3?!3| 3O /7V $S p o n s o r e d
1pc New Siemens 6ES7223-1HF22-0XA0 Free Shipping
Brand New · Siemens
S$ 138.24
or Best Offer
Free shipping
+^Q &V * Z] w.?Q BG!|/ P R$
6ES7288-1CR20-0AA1 New SIEMENS CPU Module 6ES7288-1CR20-0AA1
Brand New · Siemens
S$ 154.78
or Best Offer
Free shipping
+^ GQ J&I * M] w.?!|/ V$ GI
New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 173.24
or Best Offer
Free shipping
+^JX A&*S ] w.?!8L |G/ 1$
New ListingNew Siemens 6ES7 288-3AM06-0AA0 / 6ES7288-3AM06-0AA0 Analog l/O Module
Brand New · Siemens
S$ 169.11
or Best Offer
Free shipping
BJ 0+^F KO Y&* ]X w. ?!|/3 $
6ES7231-0HF22-0XA0 1PCS NEW SIEMENS PLC SIMATIC S7-200, EM231 6ES7231-0HF22-0XA0
Brand New · Siemens
S$ 179.13
or Best Offer
Free shipping
3+A^ N &Z* ] VwI. GY?!| GQ/ $
SIEMENS 6ES7 215-2BD00-0XB0 SIMATIC S7-200 CPU 215-2 PROFIBUS DP COMPACT UNIT
New (Other) · Siemens
S$ 1,402.47
Free shipping
90+ PB^ &* ] Q4 w.?!|3/ 5 Z$
New Siemens 6ES7288-1CR40-0AA0 6ES72881CR400AA0 SIMATIC S7-200 SMART CPU CR40
Brand New · Siemens
S$ 327.81
or Best Offer
Free shipping
+I^1 Z9 &* 08] w.KW? !|/ $S p o n s o r e d
New Siemens 6ES7288-1CR60-0AA0 6ES7 288-1CR60-0AA0 SIMATIC S7-200 SMART CPU CR60
Brand New · Siemens
S$ 367.56
Free shipping
8S OB+ L^ X&* ] Qw5 .?H!9| / $S p o n s o r e d
6ES7314-6EH04-0AB0 New Sealed Siemens SIMATIC S7-300，CPU 6ES 7314-6EH04-0AB0
Brand New · Siemens
S$ 1,590.89
or Best Offer
Free shipping
+C^ &*J ] 1Z w 3.?2!|/ D$7
New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 157.56
or Best Offer
Free shipping
+^ &XP* ] 0wG 3X .?!|9C/ $
6ES7216-2AD23-0XB0 6ES7 216-2AD23-0XB0 New Siemens S7-200 CPU 226
Brand New · Siemens
S$ 157.03
or Best Offer
Free shipping
+^2 &* 6] w .?I!|W / Q$4
New Sealed Siemens 6ES7223-1HF22-0XA0 Fast Shipping
Brand New · Siemens
S$ 139.19
or Best Offer
Free shipping
OC +^KQ &* 0L L] Vw .?!T|L/ $
6ES7 223-1PH22-0XA8 NEW SIEMENS Digital Input/Output Module 6ES7223-1PH22-0XA8
Brand New · Siemens
S$ 72.44
Was: S$ 80.50was - S$ 80.50
or Best Offer
Free shipping
+^ &YL* 3B] w U.?!2| / F$X
SIEMENS 6ES7 215-1BG40-0XB0 6ES7215-1BG40-0XB0 CPU Module New In Box Fedex DHL
Brand New · Siemens
S$ 1,109.92
or Best Offer
S$ 8.75 shipping
+D^ E&* L]V w TS P.?!|/X $
New Siemens 6ES7216-2BD23-0XB0 6ES7 216-2BD23-0XB0 SIMATIC S7-200 CPU 226
Brand New · Siemens
S$ 274.01
or Best Offer
Free shipping
RN+^ &* 3] w8. ?4P M!|/ $A
6ES7222-1BD22-0XA0 1PCS NEW SIEMENS PLC SIMATIC S7-200 EM222 6ES7222-1BD22-0XA0
Brand New · Siemens
S$ 178.02
or Best Offer
Free shipping
+7^ &*Z A ]S w .?!5|/5 $9
1 PCS New In Box Siemens 6ES7288-3AR04-0AA0 6ES7 288-3AR04-0AA0 PLC Module
Brand New · Siemens
S$ 251.43
or Best Offer
Free shipping
W3 +V7^ &* MZ] 3wL .?!Z|W/ $
New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0
Brand New · Siemens
S$ 179.13
Free shipping
+^ 7Z& * ]XM MS w.?!|P/ Q 3$
6ES7510-1DJ01-0AB0 1PCS Brand New Siemens 6ES7 510-1DJ01-0AB0 Fast shipment
Brand New · Siemens
S$ 558.38
or Best Offer
Free shipping
+^R &H * ] JY 3Gw. ?Q!|/6 B$
Siemens 6ES7223-1BL22-0XA0 Expansion Module 6ES7 223-1BL22-0XA0 (New Boxed) B3
Brand New · Siemens
S$ 137.39
S$ 19.06 shipping
+6C^ B&*4 ]0 w6.?! |7/D $
Siemens 6ES7 151-7AA21-0AB0 ET 200S CPU SIMATIC PROFIBUS DP Processor Module
Brand New · Siemens
S$ 1,137.68
Was: S$ 1,197.56was - S$ 1,197.56
or Best Offer
Free shipping
+G^X LD & AN * ] wY.?!|/ $S
New In Box SIEMENS 6ES7 223-1BL32-0XB0 6ES7223-1BL32-0XB0 I/O Module
Brand New · Siemens
S$ 149.28
Was: S$ 160.51was - S$ 160.51
Free shipping
R+^R &X1* N] I w.Z?E !|UY / $
New ListingNew Siemens 6ES7 288-2DR16-0AA0 / 6ES7288-2DR16-0AA0 Digital I/O Module
Brand New · Siemens
S$ 140.45
or Best Offer
Free shipping
A6+ ^ EG& L*M ] w.?!|/ W$F
1PCS In Box New Brand PLC Module Free Shipping SIEMENS 6ES72881SR200AA1
Brand New · Siemens
S$ 236.50
or Best Offer
Free shipping
+^C T P&* 4] wQ.?4! R|I/ $
New Siemens 6ES7214-1AD23-0XB0 6ES7 214-1AD23-0XB0 SIMATIC S7-200, CPU 224
Brand New · Siemens
S$ 177.14
or Best Offer
Free shipping
AU+^ C &2 2T* ] w .?HB! |P/L $
NEW 6ES7 223-1HF22-0XA0 Siemens 6ES7223-1HF22-0XA0 Digital Input/Output Module
Brand New · Siemens
S$ 136.15
Free shipping
JN CO+^ 5&* ]1 w 2.?!|8 /T $
New Siemens 6ES7288-1CR40-0AA0 6ES7 288-1CR40-0AA0 SIMATIC S7-200 SMART CPU CR40
Brand New · Siemens
S$ 335.52
Free shipping
+^ P4&* H4 ] w.0?!|6/ $ IFS p o n s o r e d
New Siemens 6ES7288-1SR20-0AA1 6ES7 288-1SR20-0AA1 SIMATIC S7-200 SMART CPU SR20
Brand New · Siemens
S$ 231.90
or Best Offer
Free shipping
J+9 ^Q &Z O*4 Z] wE .?!|/I $S p o n s o r e d

Siemens Simatic S7 Control Systems & PLCs S7/200 Controller Platform

Shop by Category

3,555 Results

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224

1PCS SIMATIC S7-200 SMART New Brand Free Shipping SIEMENS 6ES7288-1SR60-0AA1

6ES7214-1BD23-0XB0 西门子 CPU 模块全新带盒!Spot Goods GNDM-

6ES7 222-1EF22-0XA0 NEW SIEMENS PLC SIMATIC S7-200 EM222 6ES7222-1EF22-0XA0

New Siemens 6ES7223-1HF22-0XA0 1 PCS With Good Conditions intact

Siemens Simatic S7-200 6ES72141AD23-0XB0- Guaranteed Working Condition

SIEMENS SIMATIC S7-1200 CPU 1214C DC/DC/DC 6ES7 214-1HG40-0XB0

6ES7212-1HE40-0XB0 - S7-1200, CPU 1212C, DC/DC/relay, BRAND NEW- UK STOCK

New Siemens 6ES7223-1HF22-0XA0 1 PCS With Good Conditions intact

6ES7 214-2AD23-0XB8 1PC NEW SIEMENS S7-200 CPU 224 6ES7214-2AD23-0XB8 2AD23-0XB8

New Siemens 6ES7223-1BL32-0XB0 S7-1200 Digital I/O SM 1223 6ES7 223-1BL32-0XB0

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224

1PC Siemens 6ES7272-0AA30-0YA0 6ES7 272-0AA30-0YA0 S7

6ES7314-6EH04-0AB0 New Sealed Siemens SIMATIC S7-300，CPU 6ES 7314-6EH04-0AB0

New Siemens 6ES7 288-1SR60-0AA1 6ES7288-1SR60-0AA1 SIMATIC S7-200 SMART CPU SR60

New Siemens 6ES7288-1ST20-0AA1 6ES72881ST200AA1 SIMATIC S7-200 SMART CPU ST20

New Siemens SIMATIC S7-200 SMART CPU CR40 6ES7288-1CR40-0AA0 6ES7 288-1CR40-0AA0

6ES7 223-1PH22-0XA8 NEW SIEMENS 6ES7223-1PH22-0XA8 Digital Input/Output Module

1PC NEW IN BOX Siemens 6ES7214-1BG31-0XB0 6ES7 214-1BG31-0XB0 FAST DELIVERY

6ES7212-1BB23-0XB8 1PCS Unopened New Siemens 6ES7 212-1BB23-0XB8 Fast delivery

New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0

6ES7223-1HF22-0XA0 NEW SIEMENS DIGITAL OUTPUT/INPUT MOUDLES 6ES7223-1HF22-0XA0

New Siemens 6ES7134-4LB02-0AB0 Simatic S7 Analog Electronic Module Unit in Box

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224

New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0

New Siemens 6ES7216-2BD23-0XB0 6ES72162BD230XB0 SIMATIC S7-200 CPU 226

1PCS Brand NEW Siemens Simatic PLC 6ES7223-1HF22-0XA0

1PCS 6ES7223-1BL32-0XB0 for Brand NEW Siemens Simatic S7-1200 with box

New Siemens 6ES7288-1SR20-0AA1 6ES72881SR200AA1 SIMATIC S7-200 SMART CPU SR20

1pc New Siemens 6ES7288-1CR60-0AA0 Central Processing Unit SIMATIC S7-200 CR60

New Siemens 6ES7288-1ST20-0AA1 6ES72881ST200AA1 SIMATIC S7-200 SMART CPU ST20

SIEMENS Simatic S7-200 SMART 6ES7288-1ST30-0AA1 6ES7 288-1ST30-0AA1 CPU module

1pc New Siemens 6ES7223-1HF22-0XA0 Free Shipping

6ES7288-1CR20-0AA1 New SIEMENS CPU Module 6ES7288-1CR20-0AA1

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224

New ListingNew Siemens 6ES7 288-3AM06-0AA0 / 6ES7288-3AM06-0AA0 Analog l/O Module

6ES7231-0HF22-0XA0 1PCS NEW SIEMENS PLC SIMATIC S7-200, EM231 6ES7231-0HF22-0XA0

SIEMENS 6ES7 215-2BD00-0XB0 SIMATIC S7-200 CPU 215-2 PROFIBUS DP COMPACT UNIT

New Siemens 6ES7288-1CR40-0AA0 6ES72881CR400AA0 SIMATIC S7-200 SMART CPU CR40

New Siemens 6ES7288-1CR60-0AA0 6ES7 288-1CR60-0AA0 SIMATIC S7-200 SMART CPU CR60

6ES7314-6EH04-0AB0 New Sealed Siemens SIMATIC S7-300，CPU 6ES 7314-6EH04-0AB0

New Siemens 6ES7 214-1AD23-0XB0 6ES7214-1AD23-0XB0 SIMATIC S7-200, CPU 224

6ES7216-2AD23-0XB0 6ES7 216-2AD23-0XB0 New Siemens S7-200 CPU 226

New Sealed Siemens 6ES7223-1HF22-0XA0 Fast Shipping

6ES7 223-1PH22-0XA8 NEW SIEMENS Digital Input/Output Module 6ES7223-1PH22-0XA8

SIEMENS 6ES7 215-1BG40-0XB0 6ES7215-1BG40-0XB0 CPU Module New In Box Fedex DHL

New Siemens 6ES7216-2BD23-0XB0 6ES7 216-2BD23-0XB0 SIMATIC S7-200 CPU 226

6ES7222-1BD22-0XA0 1PCS NEW SIEMENS PLC SIMATIC S7-200 EM222 6ES7222-1BD22-0XA0

1 PCS New In Box Siemens 6ES7288-3AR04-0AA0 6ES7 288-3AR04-0AA0 PLC Module

New Siemens 6ES7216-2BD23-0XB0 SIMATIC S7-200 CPU 226 6ES7 216-2BD23-0XB0

6ES7510-1DJ01-0AB0 1PCS Brand New Siemens 6ES7 510-1DJ01-0AB0 Fast shipment

Siemens 6ES7223-1BL22-0XA0 Expansion Module 6ES7 223-1BL22-0XA0 (New Boxed) B3

Siemens 6ES7 151-7AA21-0AB0 ET 200S CPU SIMATIC PROFIBUS DP Processor Module

New In Box SIEMENS 6ES7 223-1BL32-0XB0 6ES7223-1BL32-0XB0 I/O Module

New ListingNew Siemens 6ES7 288-2DR16-0AA0 / 6ES7288-2DR16-0AA0 Digital I/O Module

1PCS In Box New Brand PLC Module Free Shipping SIEMENS 6ES72881SR200AA1

New Siemens 6ES7214-1AD23-0XB0 6ES7 214-1AD23-0XB0 SIMATIC S7-200, CPU 224

NEW 6ES7 223-1HF22-0XA0 Siemens 6ES7223-1HF22-0XA0 Digital Input/Output Module

New Siemens 6ES7288-1CR40-0AA0 6ES7 288-1CR40-0AA0 SIMATIC S7-200 SMART CPU CR40

New Siemens 6ES7288-1SR20-0AA1 6ES7 288-1SR20-0AA1 SIMATIC S7-200 SMART CPU SR20