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Counter Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
A5E00706949-01
4-5
4.3 S_CU Up Counter
Symbol
S_CU
PV
Q
CV
R
CV_BCD
CU
S
English German
C no. Z no.
Z_VORW
ZW
Q
DUAL
R
DEZ
ZV
S
Parameter
English
Parameter
German
Data Type Memory
Area
Description
C no. Z no. COUNTER C Counter identification num-
ber; range depends of CPU
CU ZV BOOL I, Q, M, L, D Count up input
S S BOOL I, Q, M, L, D Set input for presetting
counter
PV ZW WORD I, Q, M, L, D
or constant
Enter counter value as
C#<value> in the range
from 0 to 999
PV ZW WORD I, Q, M, L, D Value for presetting
counter
R R BOOL I, Q, M, L, D Reset input
CV DUAL WORD I, Q, M, L, D Current counter value,
hexadecimal number
CV_BCD DEZ WORD I, Q, M, L, D Current counter value,
BCD coded
Q Q BOOL I, Q, M, L, D Status of the counter
Description
S_CU (Up Counter) is preset with the value at input PV if there is a positive edge at
input S.
The counter is reset if there is a "1" at input R and the count value is then set to
zero.
The counter is incremented by one if the signal state at input CU changes from "0"
to "1" and the value of the counter is less than "999".
If the counter is set and if RLO = 1 at the inputs CU, the counter will count
accordingly in the next scan cycle, even if there was no change from a positive to a
negative edge or viceversa.
The signal state at output Q is "1" if the count is greater than zero and "0" if the
count is equal to zero.
- 6ES7810-4CA08-8BW1 1
- Safety Guidelines 2
- Qualified Personnel 2
- Prescribed Usage 2
- Trademarks 2
- Disclaimer of Liability 2
- Preface 3
- Requirements 4
- Online Help 5
- Further Support 5
- Training Centers 5
- Technical Support 6
- Contents 7
- A5E00706949-01 10
- 1 Bit Logic Instructions 11
- 1.4 XOR Bit Exclusive OR 14
- 1.6 ---( ) Output Coil 16
- 1.8 ---( R ) Reset Coil 20
- 1.9 ---( S ) Set Coil 22
- Symbol 32
- 1.17 Immediate Read 33
- 1.18 Immediate Write 34
- Bit Logic Instructions 36
- 2 Comparison Instructions 37
- Symbols 38
- 2.4 CMP ? R Compare Real 42
- Comparison Instructions 44
- 3 Conversion Instructions 45
- 3.2 BCD_I BCD to Integer 46
- 3.3 I_BCD Integer to BCD 47
- 3.15 CEIL Ceiling 59
- 3.16 FLOOR Floor 60
- 4 Counter Instructions 61
- Counter Instructions 62
- 4.2 S_CUD Up-Down Counter 63
- 4.3 S_CU Up Counter 65
- 4.4 S_CD Down Counter 67
- <C no.> <Z no.> 70
- 5 Data Block Instructions 75
- Data Block Instructions 76
- 6 Logic Control Instructions 77
- 6.5 LABEL Label 81
- Logic Control Instructions 82
- 7 Integer Math Instructions 83
- Math Instructions 84
- 7.3 ADD_I Add Integer 85
- 7.4 SUB_I Subtract Integer 86
- 7.5 MUL_I Multiply Integer 87
- 7.6 DIV_I Divide Integer 88
- Integer Math Instructions 94
- Point Math Instructions 96
- 8.3 Basic Instructions 97
- Description 100
- Status word 100
- Example 100
- 8.4 Extended Instructions 103
- 9 Move Instructions 113
- Symbol 124
- SRCBLK RET_VAL 125
- 10.7 Call Multiple Instance 126
- 10.14 ---(RET) Return 134
- 11.1 Shift Instructions 135
- 11.2 Rotate Instructions 145
- Status Bit Instructions 152
- Examples 155
- Area in Memory 162
- Time Value 162
- Time Base 163
- Choosing the right Timer 164
- Timing Diagram 166
- 14.3 WOR_W (Word) OR Word 187
- Word Logic Instructions 192
- Mnemonics (International) 193
- Mnemonics (SIMATIC) 196
- B Programming Examples 201
- Clock Pulse Generator 206
- Signal Check 207
- Programming Examples 209
- Solving a Math Problem 213
- Ladder Logic Program 213
- Heating an Oven 214
- Programming Examples 216
- C Working with Ladder Logic 217
- end: AN error 218
- 5 NOP 0 222
- C.2 Parameter Transfer 223
- Working with Ladder Logic 224
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