Upon fulfilling the condition on bit IR000.00, instruction divides the value of memory location IR216 by the value of memory location HR09. The result is stored into two sequential memory locations DM0017 and DDM0018. The result is stored so that DM0017 contains round number and DM0018 contains the fraction.

Upon fulfilling the condition on bit IR000.00, instruction changes the contents of memory location IR200 so that its numerical value remains unchanged; in other words, only the representation of the location’s contents changes. If the contents of the location IR200 is “164” decimal, this instruction would convert it to “0000000010100100”. One of the purposes of this instruction is preparing the contents of memory location for one of the binary operations.

Upon fulfilling the condition on bit IR000.00, instruction changes the contents of memory location IR200 so that its numerical value remains unchanged; in other words, only the representation of the location’s contents changes. If the contents of location IR200 is “000000101100100” binarny, this instruction would convert it to “740” decimaly. One of the purposes of this instruction is preparing the contents of memory location for one of BCD operations.

The first digit to be converted, as well as the number of digits to be converted, is determined in the control word Di. If the number of digits for conversion is greater than the number of digits remaining in the word S, then the missing digits are taken from the starting digit anew. The structure of the control word Di is shown on the picture below.

Some of the combinations of control word values along with their meaning are given below:

Upon fulfilling the condition on bit IR000.00, instruction converts three digits from the digit no.1 in the word DM0020. As there are three digits to be converted, the result will take three memory locations starting from HR10. Digit 0 in the word DM0020 is not converted.

Precise place for storing the converted value in the word R is determined by a control word Di. The same word also determines the number of words to be converted, starting from the address of the word SB. For this example, the control word would be “0001”.

The first digit to be converted, as well as the number of digits to be converted, is determined in the control word Di. If the number of digits for conversion is greater than the number of digits remaining in the word S, then the missing digits are taken from the starting digit anew. The structure of the control word Di is shown on the picture above.

Some of the combinations of control word values along with their meaning are given below:

Upon fulfilling the condition on bit IR000.00, first DMPX instruction converts two words, IR200 and IR201. The control word is “0010”, meaning that two words are converted (digit 1) and stored starting from the zero digit in the result (rightmost digit 0). After the first DMPX instruction, the second one is executed, converting two words from addresses LR10 and LR11 and storing them in the result word HR10, starting from the digit no.2. Therefore, the word HR10 contains four converted words in the following order: IR200, IR201, LR10, LR11. More detailed explanation of how the instruction works is given on the following picture.

Presuming that binary value is the one from locations IR200, IR201, LR10 and LR11, as in example, the result of conversion in the result word HR10 would be “5B7D”.

Instruction MCRO calls the subroutine with the number 010. Contents of words DM0010 - DM0013 is copied to SR232 - SR235 and upon execution of the instruction, contents of words SR236 - SR239 is copied to the words DM0020 - DM0023.

C1=000
Function is used for masking and unmasking the interrupt inputs 00003 - 00006. Masked interrupts are registered, but the part of the program assigned to them will not be executed until the mask is off. Upon unmasking interrupt input, interrupt routine will immediately take place (unless, in the meantime the bit corresponding to that interrupt input is reset with the instruction INT, parameter C1=001). The input being masked or unmasked is determined by parameter C2 according to the following scheme (bear in mind that we work with bits and not with digits of the word C2). Bits 4, 5, 6...15 should be set to zero. All interrupt inputs are masked upon starting the PLC controller.

C1=001
Function resets the registered interrupts, so that interrupt routine cannot take place upon unmasking the interrupt input. Bits 4, 5, 6...15 of the word C2 should be set to zero.

C1=002
Function reads the status of the mask for interrupt inputs 00003 - 00006 and stores the read state into the word C2. Interrupt input is masked if the state of the corresponding bit equals “1”. Bits 00 - 03 correspond to interrupt inputs 00003 - 00006.

C1=003
Function restarts the interrupt inputs in the counter mode. The current counter value (SR240 - SR243) is set to the starting state and the interrupt is unmasked. If C1=003, decremental counter is restarted, while in the case of C1=004 incremental counter is restarted. As CPM1A model of PLC does not feature incremental counter, this option should not be used. When using the options C1=003 or C1=004 differencial form of the instruction shoud be used @INT or else the current counter state (PV) will be reset to the starting state (SV) and the interrupt will never be generated. Writing the value “0000” to the starting counter state and executing the INT instruction with parameter C1=003 stops the counter and disables interrupts.

To start the counter again, non-zero value should be written to a starting value SV and the instruction INT executed. Interrupts in the counter mode can be masked by executing the instruction INT with parameter C1=000 and set corresponding bit in C2. If same is done, but with “0” for the appropriate position in the word C2 interrupt input will behave as a regular interrupt ulaz and not as counter interrupt input.

C1=100
Function masks all the interrupts including the interval timer interrupts and the high-speed counter interrupts. Masked interrupts are registered, but are not executed. This function is also called a global interrupt mask and it does not affect the masks of specific interrupts. This option should be used for temporary disabling all the interrupts. It is cmmonly used in pair, one function masks all the interrupts and the other one unmasks them. Function cannot be used within the interrupt routine.

C1=200
Function unmasks all the interrupts including the interval timer interrupts and the high-speed counter interrupts. If the specific interrupt is masked, global unmasking does not affect the state of the specific interrupt input state. Function cannot be used within the interrupt routine.

C1=001 or 003
C2 can be either a constant or an address of a word in PLC controller memory.

 C2=constant
If C2 is a constant, then it represents the starting value of decremental counter in BCD format (form 0000 to 9999 which is equivalent to 0 - 9.999 ms) and C3 represents the number of the interrupt routine (from 000 to 049).

 C2=address of a word in memory
If C2 is a word in PLC controller memory, then its contents is a starting value of decremental counter in BCD format. Cotents of the word C2+1 represents the measurement unit (BCD, 0005 - 0320) in 0.1s decrements. Interval is, in that case, 0.5 - 32ms. Starting value of the timer is calculated as C2 * (C2+1) * 0.1s. C3 represents the number of the interrupt routine.

C1=006
Function reads the current timer state. Parameter C2 represents the memory address where the read timer state is stored, while C2+1 stores the measurement unit. Parameter C3 reresents the memory address where the data concerning the time passed since the last decrementation of timer in BCD format is stored in 0.1s units.

C1=010
Function stops the timer. Parameters C2 and C3 are without function and should be set to “0000”.

C=000 or C=001
Function starts or stops comparing the current value of high-speed counter PV with the values from the comparison table created with instruction CTBL. If the comparison table wasn’t created ahead of executing the INI instruction, the error occurs. Generally, when INI instruction with C=000 is used, differential form @INI is recommended, because one set of starting comparisons is sufficient.

C=002
Function changes value of the current state of the high-speed counter or the interrupt in the counter mode.

Fast counter PV ( P=0 )
Function changes the contents of PV to 8-digit BCD number contained in the words P1 and P1+1. If differential-phase mode or ”up/down “ input mode is used, PV can have value between F838 8608 and 0838 8607, where “F” as the first digit is treated as a minus sign. PV can have value between 000 0000 and 1677 7215 in incremental mode.

Interrupt counter input PV ( P=100, P=101, P=102, P=103)
Function changes the contents of PV to 4-digit hexadecimal number from the word P1 (from 0000 to FFFF).

C=003
Function stops the pulse output.

C=004
Function changes the value of the current PV pulse output state to an 8-digit BCD value in the words P1 and P1+1. Change cannot be done while the pulse output is in function. New value can be from -16.777.215 to +16.777.215. Bit no.15 of the word P1+1 behaves like a sign: “0” stands for positive, “1” stands for negative number.

C=003
Function stops the synchronized pulse output.

Parameter P defines if either high-speed counter or pulse output will be controlled with this instruction.

Control word determines the type of data to be accessed.

C=000
Function reads the current value of PV of the specified high-speed counter or the interrupt input in counter mode.

Fast counter PV or input frequency (P=000)
When the output is used as the high-speed counter, instruction reads the current value of the specified fast counter and writes an 8-digit BCD value to D and D+1.
If differential-phase mode or ”up/down “ input mode is used, PV can have value between F838 8608 and 0838 8607, where “F” as the first digit is treated as a minus sign. PV can have value between 000 0000 and 1677 7215 in incremental mode. When the input is used as synchronic pulse input, the instruction reads the input frequency and writes an 8-digit BCD value to D and D+1. Range of the input frequency is 0000 0000 - 0002 0000.

Interrupt counter input PV ( P=100, P=101, P=102, P=103)
Function changes the contents of PV to 4-digit hexadecimal number from the word D (from 0000 to FFFF).

C=001
Function reads the status of the high-speed counter or the pulse input and stores the data into D.

Status of the high-speed counter or the pulse input 0 (P=000)
The table below shows the function of bits in the word D when P=000. Bits not mentioned are not used and are always zero.

Status of the pulse output 1 (P=010)
The table below shows the function of bits in the word D when P=010. Bits not mentioned are not used and are always zero.

C=002
Function reads the result of comparing the current value PV with 8 areas defined by instruction CTBL and stores data into D. Bits 0 to 7 contain the results of comparing with 8 ranges from the comparison table (0: not in range, 1: in range).

C=003
Function reads the value of current state of PV pulse output and stores it to 8-digit BCD value in words D and D+1. PV can have value from -16.777.215 to +16.777.215. Bit no.15 of the word D+1 behaves like a sign: “0” stands for positive, “1” stands for negative number.

When the current value of PV matches some of the specified table values or it belongs to one of the specified ranges, the appropriate subroutine is called. If the high-speed counter is not enabled in PC area (DM6642) instruction CTBL cannot be executed.

Comparing with values
Comparison table can have up to 16 values. Each of these values is assigned a number of subroutine that is called when the current value matches the table value. With CPM1 and CPM1A models, comparison is done one at a time in each cycle, while with models CPM2A and CPM2C comparison is done for all table values simultaneously. After comparing with the last table value, comparison starts from the first value again. The table below shows the structure of the comparison table containing values.
Each value is assigned three words in the table. If the value “FFFF” is used as the number of subroutine, no subroutine will be executed in case of a match.

Comparing with a range of values
Comparison table with ranges contains 8 ranges, which the current value PV is compared with. Ranges can overlap, allowing that the current value PV falls into several of these; in this case, the subroutine of the first matching area is called. If the value “FFFF” is used as the number of subroutine, no subroutine will be executed in case of a match.

In case of multiple errors, only one code will be displayed. To display the other codes, it is necessary to reset bits 00-07 of the word SR253 via instruction FAL with parameter N=00. Upon each reset, new error code will be displayed (if there is more than one error). Error code remains in PLC controller memory after the power is off. When error occurs, besides the code, programmer will be notified with blinking diode on the casing of PLC controller.

Instruction FAL with parameter N=0 may be used for resetting the message created with the instruction MSG.

PLC controller continues the program execution only when cause of error is removed. Error code remains written and may be read.