Ladder Logic (lad) for S7-300 and S7-400 Programming
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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 number; 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# 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 once 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. Counter Instructions 4.3 S_CU Up Counter Ladder Logic (LAD) for S7-300 and S7-400 Programming 60 Reference Manual, 04/2017, A5E41524738-AA Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - x x x 1 Note Avoid to use a counter at several program points (risk of counting errors). Example S_CU S CV PV R CV_BCD CU I 0.0 I 0.2 I 0.3 MW10 C10 Q Q 4.0 If I0.2 changes from "0" to "1", the counter is preset with the value of MW10. If the signal state of I0.0 changes from "0" to "1", the value of counter C10 will be incremented by one - unless the value of C10 is equal to "999". Q4.0 is "1" if C10 is not equal to zero. Counter Instructions 4.4 S_CD Down Counter Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 61 4.4 S_CD Down Counter Symbol S_CD PV Q CV R CV_BCD CD S English German C no. Z no. Z_RUECK ZW Q DUAL R DEZ ZR S Parameter English Parameter German Data Type Memory Area Description C no. Z no. COUNTER C Counter identification number; range depends of CPU CD ZR BOOL I, Q, M, L, D Count down 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# 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 counter Description S_CD (Down Counter) is set 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 decremented by one if the signal state at input CD changes from "0" to "1" and the value of the counter is greater than zero. If the counter is set and if RLO = 1 at the inputs CD, the counter will count once 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. Counter Instructions 4.4 S_CD Down Counter Ladder Logic (LAD) for S7-300 and S7-400 Programming 62 Reference Manual, 04/2017, A5E41524738-AA Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - x x x 1 Note Avoid to use a counter at several program points (risk of counting errors). Example C_CD S CV PV R CV_BCD CD I 0.0 I 0.2 I 0.3 MW10 C10 Q Q 4.0 If I0.2 changes from "0" to "1", the counter is preset with the value of MW10. If the signal state of I0.0 changes from "0" to "1", the value of counter C10 will be decremented by one - unless the value of C10 is equal to "0". Q4.0 is "1" if C10 is not equal to zero. Counter Instructions 4.5 ---( SC ) Set Counter Value Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 63 4.5 ---( SC ) Set Counter Value Symbol English German ---( SC ) ---( SZ ) value> Parameter English Parameter German Data Type Memory Area Description COUNTER C Counter number to be preset WORD I, Q, M, L, D or constant Value for presetting BCD (0 to 999) Description ---( SC ) (Set Counter Value) executes only if there is a positive edge in RLO. At that time, the preset value transferred into the specified counter. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: x - - - - 0 x - 0 Example I 0.0 SC C5 C#100 The counter C5 is preset with the value of 100 if there is a positive edge at input I0.0 (change from "0" to "1"). If there is no positive edge, the value of counter C5 remains unchanged. Counter Instructions 4.6 ---( CU ) Up Counter Coil Ladder Logic (LAD) for S7-300 and S7-400 Programming 64 Reference Manual, 04/2017, A5E41524738-AA 4.6 ---( CU ) Up Counter Coil Symbol English German ---( CU ) ---( ZV ) Parameter English Parameter German Data Type Memory Area Description COUNTER C Counter identification number; range depends on CPU Description ---( CU ) (Up Counter Coil) increments the value of the specified counter by one if there is a positive edge in the RLO and the value of the counter is less than "999". If there is no positive edge in the RLO or the counter already has the value "999", the value of the counter will be unchanged. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - 0 - - 0 Example I 0.1 C10 CU Network 1 Network 2 Network 3 I 0.0 C10 SC C#100 I 0.2 C10 R If the signal state of input I0.0 changes from "0" to "1" (positive edge in RLO), the preset value of 100 is loaded to counter C10. If the signal state of input I0.1 changes from "0" to "1" (positive edge in RLO), counter C10 count value will be incremented by one unless the value of C10 is equal to "999". If there is no positive edge in RLO, the value of C10 will be unchanged. If the signal state of I0.2 is "1", the counter C10 is reset to "0". Counter Instructions 4.7 ---( CD ) Down Counter Coil Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 65 4.7 ---( CD ) Down Counter Coil Symbol English German ---( CD ) ---( ZD ) Parameter English Parameter German Data Type Memory Area Description COUNTER C Counter identification number; range depends on CPU Description ---( CD ) (Down Counter Coil) decrements the value of the specified counter by one, if there is a positive edge in the RLO state and the value of the counter is more than "0". If there is no positive edge in the RLO or the counter has already the value "0", the value of the counter will be unchanged. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - 0 - - 0 Example I 0.1 Network 4 Network 3 Network 1 Network 2 C10 CD C10 Q 4.0 I 0.0 Z10 SC C#100 I 0.2 C10 R "0" count value detector Counter Instructions 4.7 ---( CD ) Down Counter Coil Ladder Logic (LAD) for S7-300 and S7-400 Programming 66 Reference Manual, 04/2017, A5E41524738-AA If the signal state of input I0.0 changes from "0" to "1" (positive edge in RLO), the preset value of 100 is loaded to counter C10. If the signal state of input I0.1 changes from "0" to "1" (positive edge in RLO), counter C10 count value will be decremented by one unless the value of C10 is equal to "0". If there is no positive edge in RLO, the value of C10 will be unchanged. If the count value = 0, then Q4.0 is turned on. If the signal state of input I0.2 is "1", the counter C10 is reset to "0". Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 67 5 Data Block Instructions 5.1 ---(OPN) Open Data Block: DB or DI Symbol ---(OPN) Parameter Data Type Memory Area Description BLOCK_DB DB, DI Number of DB/DI; range depends on CPU Description ---(OPN) (Open a Data Block) opens a shared data block (DB) or an instance data block (DI). The - --(OPN) function is an unconditional call of a data block. The number of the data block is transferred into the DB or DI register. The subsequent DB and DI commands access the corresponding blocks, depending on the register contents. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - - - - - Example Network 2 Network 1 OPN DB10 Q 4.0 DBX0.0 Data block 10 (DB10) is opened. The contact address (DBX0.0) refers to bit zero of data byte zero of the current data record contained in DB10. The signal state of this bit is assigned to the output Q4.0. Data Block Instructions 5.1 ---(OPN) Open Data Block: DB or DI Ladder Logic (LAD) for S7-300 and S7-400 Programming 68 Reference Manual, 04/2017, A5E41524738-AA Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 69 6 Logic Control Instructions 6.1 Overview of Logic Control Instructions Description You can use logic control instructions in all logic blocks: organization blocks (OBs), function blocks (FBs), and functions (FCs). There are logic control instructions to perform the following functions: • ---( JMP )--- Unconditional Jump • ---( JMP )--- Conditional Jump • ---( JMPN )--- Jump-If-Not Label as Address The address of a Jump instruction is a label. A label consists of a maximum of four characters. The first character must be a letter of the alphabet; the other characters can be letters or numbers (for example, SEG3). The jump label indicates the destination to which you want the program to jump. Label as Destination The destination label must be at the beginning of a network. You enter the destination label at the beginning of the network by selecting LABEL from the ladder logic browser. An empty box appears. In the box, you type the name of the label. SEG3 JMP I 0.1 = Q 4.0 I 0.4 Network 1 Network 2 Network X SEG3 . . R Q 4.1 Logic Control Instructions 6.2 ---(JMP)--- Unconditional Jump Ladder Logic (LAD) for S7-300 and S7-400 Programming 70 Reference Manual, 04/2017, A5E41524738-AA 6.2 ---(JMP)--- Unconditional Jump Symbol ---( JMP ) Description ---( JMP ) (jump within the block when 1) functions as an absolute jump when there is no other Ladder element between the left-hand power rail and the instruction (see example). A destination (LABEL) must also exist for every ---( JMP ). All instructions between the jump instruction and the label are not executed. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - - - - - Example JMP CAS1 Network X Network 1 Q 4.1 R I 0.4 : : : : CAS1 The jump is always executed and the instructions between the jump instruction and the jump label are missed out. Logic Control Instructions 6.3 ---(JMP)--- Conditional Jump Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 71 6.3 ---(JMP)--- Conditional Jump Symbol ---( JMP ) Description ---( JMP ) (jump within the block when 1) functions as a conditional jump when the RLO of the previous logic operation is "1". A destination (LABEL) must also exist for every ---( JMP ). All instructions between the jump instruction and the label are not executed. If a conditional jump is not executed, the RLO changes to "1" after the jump instruction. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - 0 1 1 0 Example I 0.0 Q 4.0 R I 0.3 Network 2 Network 1 Network 3 I 0.4 Q 4.1 R JMP CAS1 CAS1 If I0.0 = "1", the jump to label CAS1 is executed. Because of the jump, the instruction to reset output Q4.0 is not executed even if there is a logic "1" at I0.3. Logic Control Instructions 6.4 ---( JMPN ) Jump-If-Not Ladder Logic (LAD) for S7-300 and S7-400 Programming 72 Reference Manual, 04/2017, A5E41524738-AA 6.4 ---( JMPN ) Jump-If-Not Symbol ---( JMPN ) Description ---( JMPN ) (Jump-If-not) corresponds to a "goto label" function which is executed if the RLO is "0". A destination (LABEL) must also exist for every ---( JMPN ). All instructions between the jump instruction and the label are not executed. If a conditional jump is not executed, the RLO changes to "1" after the jump instruction. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: - - - - - 0 1 1 0 Example I 0.0 Q 4.0 R I 0.3 Network 2 Network 1 Network 3 I 0.4 Q 4.1 R JMP CAS1 CAS1 If I0.0 = "0", the jump to label CAS1 is executed. Because of the jump, the instruction to reset output Q4.0 is not executed even if there is a logic "1" at I0.3. Logic Control Instructions 6.5 LABEL Label Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 73 6.5 LABEL Label Symbol LABEL Description LABEL is the identifier for the destination of a jump instruction. The first character must be a letter of the alphabet; the other characters can be letters or numbers (for example, CAS1). A jump label ( LABEL) must exist for every ---( JMP ) or ---( JMPN ). Example I 0.0 Q 4.0 R I 0.3 Network 2 Network 1 Network 3 I 0.4 Q 4.1 R JMP CAS1 CAS1 If I0.0 = "1", the jump to label CAS1 is executed. Because of the jump, the instruction to reset output Q4.0 is not executed even if there is a logic "1" at I0.3. Logic Control Instructions 6.5 LABEL Label Ladder Logic (LAD) for S7-300 and S7-400 Programming 74 Reference Manual, 04/2017, A5E41524738-AA Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 75 7 Integer Math Instructions 7.1 Overview of Integer Math Instructions Description Using integer math, you can carry out the following operations with two integer numbers (16 and 32 bits): • ADD_I Add Integer • SUB_I Subtract Integer • MUL_I Multiply Integer • DIV_I Divide Integer • ADD_DI Add Double Integer • SUB_DI Subtract Double Integer • MUL_DI Multiply Double Integer • DIV_DI Divide Double Integer • MOD_DI Return Fraction Double Integer Integer Math Instructions 7.2 Evaluating the Bits of the Status Word with Integer Math Instructions Ladder Logic (LAD) for S7-300 and S7-400 Programming 76 Reference Manual, 04/2017, A5E41524738-AA 7.2 Evaluating the Bits of the Status Word with Integer Math Instructions Description The integer math instructions affect the following bits in the Status word: CC1 and CC0, OV and OS. The following tables show the signal state of the bits in the status word for the results of instructions with Integers (16 and 32 bits): Valid Range for the Result CC 1 CC 0 OV OS 0 (zero) 0 0 0 * 16 bits: -32 768 <= result < 0 (negative number) 32 bits: -2 147 483 648 <=result < 0 (negative number) 0 1 0 * 16 bits: 32 767 >= result > 0 (positive number) 32 bits: 2 147 483 647 >= result > 0 (positive number) 1 0 0 * * The OS bit is not affected by the result of the instruction. Yüklə 1,39 Mb. Dostları ilə paylaş:
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