Siemens S7-200 PLC Quick Reference

S7-200 Quick Reference Information

To help you find information more easily, this section summarizes the following information:

Special Memory Bits

Descriptions of Interrupt Events

Summary of S7-200 CPU Memory Ranges and Features

High-Speed Counters HSC0, HSC1, HSC2, HSC3, HSC4, HSC5

S7-200 Instructions

Table G-1 Special Memory Bits

Special Memory Bits
SM0.0	Always On	SM1.0	Result of operation = 0
SM0.1	First Scan	SM1.1	Overflow or illegal value
SM0.2	Retentive data lost	SM1.2	Negative result
SM0.3	Power up	SM1.3	Division by 0
SM0.4	30 s off / 30 s on	SM1.4	Table full
SM0.5	0.5 s off / 0.5 s on	SM1.5	Table empty
SM0.6	Off 1 scan / on 1 scan	SM1.6	BCD to binary conversion error
SM0.7	Switch in RUN position	SM1.7	ASCII to hex conversion error

Table G-2 Interrupt Events in Priority Order

Event Number	Interrupt Description	Priority Group	Priority in Group
8	Port 0: Receive character	Communications (highest)	0
9	Port 0: Transmit complete	0
23	Port 0: Receive message complete	0
24	Port 1: Receive message complete	1
25	Port 1: Receive character	1
26	Port 1: Transmit complete	1
19	PTO 0 complete interrupt	Discrete (middle)	0
20	PTO 1 complete interrupt	1
0	I0.0, Rising edge	2
2	I0.1, Rising edge	3
4	I0.2, Rising edge	4
6	I0.3, Rising edge	5
1	I0.0, Falling edge	6
3	I0.1, Falling edge	7
5	I0.2, Falling edge	8
7	I0.3, Falling edge	9
12	HSC0 CV=PV (current value = preset value)	10
27	HSC0 direction changed	11
28	HSC0 external reset	12
13	HSC1 CV=PV (current value = preset value)	13
14	HSC1 direction input changed	14
15	HSC1 external reset	15
16	HSC2 CV=PV	16
17	HSC2 direction changed	17
18	HSC2 external reset	18
32	HSC3 CV=PV (current value = preset value)	19
29	HSC4 CV=PV (current value = preset value)	20
30	HSC4 direction changed	21
31	HSC4 external reset	22
33	HSC5 CV=PV (current value = preset value)	23
10	Timed interrupt 0	Timed (lowest)	0
11	Timed interrupt 1	1
21	Timer T32 CT=PT interrupt	2
22	Timer T96 CT=PT interrupt	3

Table G-3 Summary of S7-200 CPU Memory Ranges and Features

Description	CPU 221	CPU 222	CPU 224	CPU 226	CPU 226XM
User program size	2 Kwords	2 Kwords	4 Kwords	4 Kwords	8 Kwords
User data size	1 Kwords	1 Kwords	2.5 Kwords	2.5 Kwords	5 Kwords
Process-image input register	I0.0 to I15.7	I0.0 to I15.7	I0.0 to I15.7	I0.0 to I15.7	I0.0 to I15.7
Process-image output register	Q0.0 to Q15.7	Q0.0 to Q15.7	Q0.0 to Q15.7	Q0.0 to Q15.7	Q0.0 to Q15.7
Analog inputs (read only)	-- --	AIW0 to AIW30	AIW0 to AIW62	AIW0 to AIW62	AIW0 to AIW62
Analog outputs (write only)	-- --	AQW0 to AQW30	AQW0 to AQW62	AQW0 to AQW62	AQW0 to AQW62
Variable memory (V)	VB0 to VB2047	VB0 to VB2047	VB0 to VB5119	VB0 to VB5119	VB0 to VB10239
Local memory (L)1	LB0 to LB63	LB0 to LB63	LB0 to LB63	LB0 to LB63	LB0 to LB63
Bit memory (M)	M0.0 to M31.7	M0.0 to M31.7	M0.0 to M31.7	M0.0 to M31.7	M0.0 to M31.7
Special Memory (SM) Read only	SM0.0 to SM179.7 SM0.0 to SM29.7	SM0.0 to SM299.7 SM0.0 to SM29.7	SM0.0 to SM549.7 SM0.0 to SM29.7	SM0.0 to SM549.7 SM0.0 to SM29.7	SM0.0 to SM549.7 SM0.0 to SM29.7
Timers Retentive on-delay 1 ms 10 ms 100 ms On/Off delay 1 ms 10 ms 100 ms	256 (T0 to T255) T0, T64 T1 to T4, and T65 to T68 T5 to T31, and T69 to T95 T32, T96 T33 to T36, and T97 to T100 T37 to T63, and T101 to T255	256 (T0 to T255) T0, T64 T1 to T4, and T65 to T68 T5 to T31, and T69 to T95 T32, T96 T33 to T36, and T97 to T100 T37 to T63, and T101 to T255	256 (T0 to T255) T0, T64 T1 to T4, and T65 to T68 T5 to T31, and T69 to T95 T32, T96 T33 to T36, and T97 to T100 T37 to T63, and T101 to T255	256 (T0 to T255) T0, T64 T1 to T4, and T65 to T68 T5 to T31, and T69 to T95 T32, T96 T33 to T36, and T97 to T100 T37 to T63, and T101 to T255	256 (T0 to T255) T0, T64 T1 to T4, and T65 to T68 T5 to T31, and T69 to T95 T32, T96 T33 to T36, and T97 to T100 T37 to T63, and T101 to T255
Counters	C0 to C255	C0 to C255	C0 to C255	C0 to C255	C0 to C255
High-speed counter	HC0, HC3, HC4, and HC5	HC0, HC3, HC4, and HC5	HC0 to HC5	HC0 to HC5	HC0 to HC5
Sequential control relays (S)	S0.0 to S31.7	S0.0 to S31.7	S0.0 to S31.7	S0.0 to S31.7	S0.0 to S31.7
Accumulator registers	AC0 to AC3	AC0 to AC3	AC0 to AC3	AC0 to AC3	AC0 to AC3
Jumps/Labels	0 to 255	0 to 255	0 to 255	0 to 255	0 to 255
Call/Subroutine	0 to 63	0 to 63	0 to 63	0 to 63	0 to 127
Interrupt routines	0 to 127	0 to 127	0 to 127	0 to 127	0 to 127
Positive/negative transitions	256	256	256	256	256
PID loops	0 to 7	0 to 7	0 to 7	0 to 7	0 to 7
Ports	Port 0	Port 0	Port 0	Port 0, Port 1	Port 0, Port 1

1 LB60 to LB63 are reserved by STEP 7-- Micro/WIN, version 3.0 or later.

Table G-4 High-Speed Counters HSC0, HSC3, HSC4, and HSC5

HSC0 HSC3 HSC4 HSC5 I0.0 I0.1 I0.2 I0.1 I0.3 I0.4 I0.5 I0.4 0 Clk Clk Clk Clk 1 Clk Reset Clk Reset 2 3 Clk Direction Clk Direction 4 Clk Direction Reset Clk Direction Reset 5 6 Clk Up Clk Down Clk Up Clk Down 7 Clk Up Clk Down Reset Clk Up Clk Down Reset 8 9 Phase A Phase B Phase A Phase B 10 Phase A Phase B Reset Phase A Phase B Reset 11

Mode

Table G-5 High-Speed Counters HSC1 and HSC2

HSC1 HSC2 I0.6 I0.7 I1.0 I1.1 I1.2 I1.3 I1.4 I1.5 0 Clk Clk 1 Clk Reset Clk Reset 2 Clk Reset Start Clk Reset Start 3 Clk Direction Clk Direction 4 Clk Direction Reset Clk Direction Reset 5 Clk Direction Reset Start Clk Direction Reset Start 6 Clk Up Clk Down Clk Up Clk Down 7 Clk Up Clk Down Reset Clk Up Clk Down Reset 8 Clk Up Clk Down Reset Start Clk Up Clk Down Reset Start 9 Phase A Phase B Phase A Phase B 10 Phase A Phase B Reset Phase A Phase B Reset 11 Phase A Phase B Reset Start Phase A Phase B Reset Start

Mode

Math, Increment, and Decrement instructions +I IN1, OUT +D IN1, OUT +R IN1, OUT Add Integer, Double Integer or Real IN1+OUT=OUT --I IN1, OUT --D IN1, OUT --R IN1, OUT Subtract Integer, Double Integer, or Real OUT--IN1=OUT MUL IN1, OUT Multiply Integer (16*16-->32) *I IN1, OUT *D IN1, OUT *R IN1, IN2 Multiply Integer, Double Integer, or Real IN1 * OUT = OUT DIV IN1, OUT Divide Integer (16/16-->32) /I IN1, OUT /D, IN1, OUT /R IN1, OUT Divide Integer, Double Integer, or Real OUT / IN1 = OUT SQRT IN, OUT Square Root LN IN, OUT Natural Logarithm EXP IN, OUT Natural Exponential SIN IN, OUT Sine COS IN, OUT Cosine TAN IN, OUT Tangent INCB OUT INCW OUT INCD OUT Increment Byte, Word or DWord DECB OUT DECW OUT DECD OUT Decrement Byte, Word, or DWord PID TBL, LOOP PID Loop Timer and Counter Instructions TON Txxx, PT TOF Txxx, PT TONR Txxx, PT On-Delay Timer Off-Delay Timer Retentive On-Delay Timer CTU Cxxx, PV CTD Cxxx, PV CTUD Cxxx, PV Count Up Count Down Count Up/Down Real Time Clock Instructions TODR T TODW T Read Time of Day clock Write Time of Day clock Program Control Instructions END Conditional End of Program STOP Transition to STOP Mode WDR WatchDog Reset (300 ms) JMP N LBL N Jump to defined Label Define a Label to Jump to CALL N [N1,...] CRET Call a Subroutine [N1, ... up to 16 optional parameters] Conditional Return from SBR FOR INDX,INIT,FINAL NEXT For/Next Loop LSCR N SCRT N CSCRE SCRE Load, Transition, Conditional End, and End Sequence Control Relay

Boolean Instructions
LD Bit LDI Bit LDN Bit LDNI Bit	Load Load Immediate Load Not Load Not Immediate
A Bit AI Bit AN Bit ANI Bit	AND AND Immediate AND Not AND Not Immediate
O Bit OI Bit ON Bit ONI Bit	OR OR Immediate OR Not OR Not Immediate
LDBx IN1, IN2	Load result of Byte Compare IN1 (x:<, <=,=, >=, >, <>I) IN2
ABx IN1, IN2	AND result of Byte Compare IN1 (x:<, <=,=, >=, >, <>) IN2
OBx IN1, IN2	OR result of Byte Compare IN1 (x:<, <=,=, >=, >, <>) IN2
LDWx IN1, IN2	Load result of Word Compare IN1 (x:<, <=,=, >=, >, <>) IN2
AWx IN1, IN2	AND result of Word Compare IN1 (x:<, <=,=, >=, >, <>)I N2
OWx IN1, IN2	OR result of Word Compare IN1 (x:<, <=,=, >=, >, <>) IN2
LDDx IN1, IN2	Load result of DWord Compare IN1 (x:<, <=,=, >=, >, <>) IN2
ADx IN1, IN2	AND result of DWord Compare IN1 (x:<, <=,=, >=, >, <>)IN2
ODx IN1, IN2	OR result of DWord Compare IN1 (x:<, <=,=, >=, >, <>) IN2
LDRx IN1, IN2	Load result of Real Compare IN1 (x:<, <=,=, >=, >, <>) IN2
ARx IN1, IN2	AND result of Real Compare IN1 (x:<, <=,=, >=, >, <>) IN2
ORx IN1, IN2	OR result of Real Compare IN1 (x:<, <=,=, >=, >, <>) IN2
NOT	Stack Negation
EU ED	Detection of Rising Edge Detection of Falling Edge
= Bit =I Bit	Assign Value Assign Value Immediate
S Bit, N R Bit, N SI Bit, N RI Bit, N	Set bit Range Reset bit Range Set bit Range Immediate Reset bit Range Immediate
LDSx IN1, IN2 ASx IN1, IN2 OSx IN1, IN2	Load result of String Compare IN1 (x: =, <>) IN2 AND result of String Compare IN1 (x: =, <>) IN2 OR result of String Compare IN1 (x: =, <>) IN2
ALD OLD	And Load Or Load
LPS LRD LPP LDS N	Logic Push (stack control) Logic Read (stack control) Logic Pop (stack control) Load Stack (stack control)
AENO	And ENO

Table, Find, and Conversion Instructions ATT DATA, TBL Add data to table LIFO TBL, DATA FIFO TBL, DATA Get data from table FND= TBL, PTN, INDX FND<> TBL, PTN, INDX FND< TBL, PTN, INDX FND> TBL, PTN, INDX Find data value in table that matches comparison FILL IN, OUT, N Fill memory space with pattern BCDI OUT IBCD OUT Convert BCD to Integer Convert Integer to BCD BTI IN, OUT ITB IN, OUT ITD IN, OUT DTI IN, OUT Convert Byte to Integer Convert Integer to Byte Convert Integer to Double Integer Convert Double Integer to Integer DTR IN, OUT TRUNC IN, OUT ROUND IN, OUT Convert DWord to Real Convert Real to Double Integer Convert Real to Double Integer ATH IN, OUT, LEN HTA IN, OUT, LEN ITA IN, OUT, FMT DTA IN, OUT, FM RTA IN, OUT, FM Convert ASCII to Hex Convert Hex to ASCII Convert Integer to ASCII Convert Double Integer to ASCII Convert Real to ASCII DECO IN, OUT ENCO IN, OUT Decode Encode SEG IN, OUT Generate 7--segment pattern ITS IN, FMT, OUT DTS IN, FMT, OUT RTS IN, FMT, OUT Convert Integer to String Convert Double Integer to String Convert Real to String STI STR, INDX, OUT STD STR, INDX, OUT STR STR, INDX, OUT Convert Substring to Integer Convert Substring to Double Integer Convert Substring to Real Interrupt Instructions CRETI Conditional Return from Interrupt ENI DISI Enable Interrupts Disable Interrupts ATCH INT, EVNT DTCH EVNT Attach Interrupt routine to event Detach event Communications Instructions XMT TBL, PORT RCV TBL, PORT Freeport transmission Freeport receive message NETR TBL, PORT NETW TBL, PORT Network Read Network Write GPA ADDR, PORT SPA ADDR, PORT Get Port Address Set Port Address High-Speed Instructions HDEF HSC, MODE Define High-Speed Counter mode HSC N Activate High-Speed Counter PLS Q Pulse Output

Move, Shift, and Rotate Instructions
MOVB IN, OUT MOVW IN, OUT MOVD IN, OUT MOVR IN, OUT	Move Byte, Word, DWord, Real
BIR IN, OUT BIW IN, OUT	Move Byte Immediate Read Move Byte Immediate Write
BMB IN, OUT, N BMW IN, OUT, N BMD IN, OUT, N	Block Move Byte, Word, DWord
SWAP IN	Swap Bytes
SHRB DATA, S_BIT, N	Shift Register Bit
SRB OUT, N SRW OUT, N SRD OUT, N	Shift Right Byte, Word, DWord
SLB OUT, N SLW OUT, N SLD OUT, N	Shift Left Byte, Word, DWord
RRB OUT, N RRW OUT, N RRD OUT, N	Rotate Right Byte, Word, DWord
RLB OUT, N RLW OUT, N RLD OUT, N	Rotate Left Byte, Word, DWord
Logical Instructions
ANDB IN1, OUT ANDW IN1, OUT ANDD IN1, OUT	Logical AND of Byte, Word, and DWord
ORB IN1, OUT ORW IN1, OUT ORD IN1, OUT	Logical OR of Byte, Word, and DWord
XORB IN1, OUT XORW IN1, OUT XORD IN1, OUT	Logical XOR of Byte, Word, and DWord
INVB OUT INVW OUT INVD OUT	Invert Byte, Word and DWord (1’s complement)
String Instructions
SLEN IN, OUT SCAT IN, OUT SCPY IN, OUT SSCPY IN, INDX, N, OUT CFND IN1, IN2, OUT SFND IN1, IN2, OUT	String Length Concatenate String Copy String Copy Substring from String Find First Character within String Find String within String