DRUM: Implement sequencer (S7-1500)

DRUM: Implement sequencer

Description

You can use the "Implement sequencer" instruction to assign the programmed values of the OUT_VAL parameter of the corresponding step to the programmed output bits (OUT1 to OUT16) and the output word (OUT_WORD). The specific step must thereby satisfy the conditions of the programmed enable mask on the S_MASK parameter while the instruction remains at this step. The instruction advances to the next step if the event for the step is true and the programmed time for the current step elapses, or if the value at the JOG parameter changes from "0" to "1". The instruction is reset when the signal state of the RESET parameter changes to "1". The current step is hereby equated to the preset step (DSP).

The amount of time spent on a step is determined by the product of the preset timebase (DTBP) and the preset counter value (S_PRESET) for each step. At the start of a new step, this calculated value is loaded into the DCC parameter, which contains the time remaining for the current step. If, for example the value at the DTBP parameter is "2" and the preset value for the first step is "100" (100 ms), the DCC parameter has the value "200" (200 ms).

A step can be programmed with a timer value, an event, or both. Steps that have an event bit and the timer value "0" advance to the next step as soon as the signal state of the event bit is "1". Steps that are programmed only with a timer value start the time immediately. Steps that are programmed with an event bit and a timer value greater than "0" start the time when the signal state of the event bit is "1". The event bits are initialized with a signal state of "1".

When the sequencer is on the last programmed step (LST_STEP) and the time for this step has expired, the signal state on the Q parameter is set to "1"; otherwise it is set to "0". When the Q parameter is set, the instruction remains on the step until it is reset.

In the configurable mask (S_MASK) you can select the individual bits in the output word (OUT_WORD) and set or reset the output bits (OUT1 to OUT16) by means of the output values (OUT_VAL). When a bit of the configurable mask has a signal state of "1", the OUT_VAL value sets/resets the corresponding bit. If the signal state of a bit of the configurable mask is "0", the corresponding bit is left unchanged. All the bits of the configurable mask for all 16 steps are initialized with a signal state of "1".

The output bit at the OUT1 parameter corresponds to the least significant bit of the output word (OUT_WORD). The output bit at the OUT16 parameter corresponds to the most significant bit of the output word (OUT_WORD).

Parameters

The following table shows the parameters of the "Implement sequencer" instruction:

Parameter	Declaration	Data type	Memory area	Description
EN	Input	BOOL	I, Q, M, D, L, T, C or constant	Enable input
ENO	Output	BOOL	I, Q, M, D, L	Enable output
RESET	Input	BOOL	I, Q, M, D, L or constant	The signal state "1" indicates a reset condition.
JOG	Input	BOOL	I, Q, M, D, L or constant	When the signal state changes from "0" to "1", the instruction advances to the next step.
DRUM_EN	Input	BOOL	I, Q, M, D, L or constant	The signal state "1" allows the sequencer to advance based on the event and time criteria.
LST_STEP	Input	BYTE	I, Q, M, D, L or constant	Maximum step number (for example: LST_STEP = 16#08; a maximum of 8 steps is possible.)
EVENT(i), 1 ≤ i ≤ 16	Input	BOOL	I, Q, M, D, L or constant	Event bit (i); Initial signal state is "1".
OUT(j), 1 ≤ j ≤ 16	Output	BOOL	I, Q, M, D, L	Output bit (j)
Q	Output	BOOL	I, Q, M, D, L	The signal state "1" indicates that the time for the last step has elapsed.
OUT_WORD	Output	WORD	I, Q, M, D, L, P	Word address to which the sequencer writes the output values.
ERR_CODE	Output	WORD	I, Q, M, D, L, P	Error information
JOG_HIS	Static	BOOL	I, Q, M, D, L or constant	JOG parameter history bit
EOD	Static	BOOL	I, Q, M, D, L or constant	The signal state "1" indicates that the time for the last step has elapsed.
DSP	Static	BYTE	I, Q, M, D, L, P or constant	Preset step of the sequencer
DSC	Static	BYTE	I, Q, M, D, L, P or constant	Current step of the sequencer
DCC	Static	DWORD	I, Q, M, D, L, P or constant	Current numerical value of the sequencer
DTBP	Static	WORD	I, Q, M, D, L, P or constant	Preset timebase of the sequencer
PrevTime	Static	TIME	I, Q, M, D, L or constant	Previous system time
S_PRESET	Static	ARRAY[1..16] of WORD	I, Q, M, D, L or constant	Preset counter value for each step [1 to 16] where one clock pulse = 1 ms.
OUT_VAL	Static	ARRAY[1..16, 0..15] of BOOL	I, Q, M, D, L or constant	Output values for each step [1 to 16, 0 to 15].
S_MASK	Static	ARRAY[1..16, 0..15] of BOOL	I, Q, M, D, L or constant	Configurable mask for each step [1 to 16, 0 to 15]. Initial signal states are "1".

ERR_CODE parameter

The following table shows the meaning of the values of the ERR_CODE parameter:

ERR_CODE*	Explanation
W#16#0000	No error
W#16#000B	The value at the LST_STEP parameter is less than 1 or greater than 16.
W#16#000C	The value at the DSC parameter is less than 1 or greater than the value of the LST_STEP parameter.
W#16#000D	The value at the DSP parameter is less than 1 or greater than the value of the LST_STEP parameter.
*The error codes can be displayed as integer or hexadecimal value in the program editor. You can find information on switching the display formats under "See also".

Example

In the following example the instruction advances from step 1 to step 2. The output bits (OUT1 to OUT16) and the output word (OUT_WORD) are set according to the mask configured for step 2 and the values of the OUT_VAL parameter.

Note

You can initialize static parameters in the data block.

The following tables show how the instruction works using specific values.

Before processing

In this example, the following values are used for initializing the input parameters:

Parameters	Operand	Address	Value
RESET	Tag_Reset	M0.0	FALSE
JOG	Tag_Input_JOG	M0.1	FALSE
DRUM_EN	Tag_Input_DrumEN	M0.2	TRUE
LST_STEP	Tag_Number_LastStep	MB1	B#16#08
EVENT2	MyTag_Event_2	M20.0	FALSE
EVENT4	MyTag_Event_4	M20.1	FALSE
EVENT6	MyTag_Event_6	M20.2	FALSE
EVENT8	MyTag_Event_8	M20.3	FALSE
EVENT10	MyTag_Event_10	M20.4	FALSE
EVENT12	MyTag_Event_12	M20.5	FALSE
EVENT14	MyTag_Event_14	M20.6	FALSE
EVENT16	MyTag_Event_16	M20.7	FALSE

The following values are saved in the "DRUM_DB" instance data block of the instruction:

Parameter	Address	Value
JOG_HIS	DBX12.0	FALSE
EOD	DBX12.1	FALSE
DSP	DBB13	W#16#0001
DSC	DBB14	W#16#0001
DCC	DBD16	DW#16#0000000A
DTBP	DBW20	W#16#0001
S_PRESET[1]	DBW26	W#16#0064
S_PRESET[2]	DBW28	W#16#00C8
OUT_VAL[1,0]	DBX58.0	TRUE
OUT_VAL[1,1]	DBX58.1	TRUE
OUT_VAL[1,2]	DBX58.2	TRUE
OUT_VAL[1,3]	DBX58.3	TRUE
OUT_VAL[1,4]	DBX58.4	TRUE
OUT_VAL[1,5]	DBX58.5	TRUE
OUT_VAL[1,6]	DBX58.6	TRUE
OUT_VAL[1,7]	DBX58.7	TRUE
OUT_VAL[1,8]	DBX59.0	TRUE
OUT_VAL[1,9]	DBX59.1	TRUE
OUT_VAL[1,10]	DBX59.2	TRUE
OUT_VAL[1,11]	DBX59.3	TRUE
OUT_VAL[1,12]	DBX59.4	TRUE
OUT_VAL[1,13]	DBX59.5	TRUE
OUT_VAL[1,14]	DBX59.6	TRUE
OUT_VAL[1,15]	DBX59.7	TRUE
OUT_VAL[2,0]	DBX60.0	FALSE
OUT_VAL[2,1]	DBX60.1	FALSE
OUT_VAL[2,2]	DBX60.2	FALSE
OUT_VAL[2,3]	DBX60.3	FALSE
OUT_VAL[2,4]	DBX60.4	FALSE
OUT_VAL[2,5]	DBX60.5	FALSE
OUT_VAL[2,6]	DBX60.6	FALSE
OUT_VAL[2,7]	DBX60.7	FALSE
OUT_VAL[2,8]	DBX61.0	FALSE
OUT_VAL[2,9]	DBX61.1	FALSE
OUT_VAL[2,10]	DBX61.2	FALSE
OUT_VAL[2,11]	DBX61.3	FALSE
OUT_VAL[2,12]	DBX61.4	FALSE
OUT_VAL[2,13]	DBX61.5	FALSE
OUT_VAL[2,14]	DBX61.6	FALSE
OUT_VAL[2,15]	DBX61.7	FALSE
S_MASK[2,0]	DBX92.0	FALSE
S_MASK[2,1]	DBX92.1	TRUE
S_MASK[2,2]	DBX92.2	TRUE
S_MASK[2,3]	DBX92.3	TRUE
S_MASK[2,4]	DBX92.4	TRUE
S_MASK[2,5]	DBX92.5	FALSE
S_MASK[2,6]	DBX92.6	TRUE
S_MASK[2,7]	DBX92.7	TRUE
S_MASK[2,8]	DBX93.0	FALSE
S_MASK[2,9]	DBX93.1	FALSE
S_MASK[2,10]	DBX93.2	TRUE
S_MASK[2,11]	DBX93.3	TRUE
S_MASK[2,12]	DBX93.4	TRUE
S_MASK[2,13]	DBX93.5	TRUE
S_MASK[2,14]	DBX93.6	FALSE
S_MASK[2,15]	DBX93.7	TRUE

The output parameters are set to the following values before the execution of the instruction:

Parameter	Operand	Address	Value
Q	Tag_Output_Q	M6.0	FALSE
OUTWORD	Tag_OutputWord	MW8	W#16#FFFF
OUT1	MyTag_Output_1	M4.0	TRUE
OUT2	MyTag_Output_2	M4.1	TRUE
OUT3	MyTag_Output_3	M4.2	TRUE
OUT4	MyTag_Output_4	M4.3	TRUE
OUT5	MyTag_Output_5	M4.4	TRUE
OUT6	MyTag_Output_6	M4.5	TRUE
OUT7	MyTag_Output_7	M4.6	TRUE
OUT8	MyTag_Output_8	M4.7	TRUE
OUT9	MyTag_Output_9	M5.0	TRUE
OUT10	MyTag_Output_10	M5.1	TRUE
OUT11	MyTag_Output_11	M5.2	TRUE
OUT12	MyTag_Output_12	M5.3	TRUE
OUT13	MyTag_Output_13	M5.4	TRUE
OUT14	MyTag_Output_14	M5.5	TRUE
OUT15	MyTag_Output_15	M5.6	TRUE
OUT16	MyTag_Output_16	M5.7	TRUE

After processing

The following values are written to the output parameters after the instruction has been executed:

Parameter	Operand	Address	Value
OUT1	MyTag_Output_1	M4.0	TRUE
OUT2	MyTag_Output_2	M4.1	FALSE
OUT3	MyTag_Output_3	M4.2	FALSE
OUT4	MyTag_Output_4	M4.3	FALSE
OUT5	MyTag_Output_5	M4.4	FALSE
OUT6	MyTag_Output_6	M4.5	TRUE
OUT7	MyTag_Output_7	M4.6	FALSE
OUT8	MyTag_Output_8	M4.7	FALSE
OUT9	MyTag_Output_9	M5.0	TRUE
OUT10	MyTag_Output_10	M5.1	TRUE
OUT11	MyTag_Output_11	M5.2	FALSE
OUT12	MyTag_Output_12	M5.3	FALSE
OUT13	MyTag_Output_13	M5.4	FALSE
OUT14	MyTag_Output_14	M5.5	FALSE
OUT15	MyTag_Output_15	M5.6	TRUE
OUT16	MyTag_Output_16	M5.7	FALSE
Q	Tag_Output_Q	M6.0	FALSE
OUTWORD	Tag_OutputWord	MW8	W#16#4321
ERR_CODE	Tag_ErrorCode	MW10	W#16#0000

The following values are changed in the instance data block "DRUM_DB" of the instruction after the execution of the instruction:

Parameter	Address	Value
JOG_HIS	DBX12.0	FALSE
EOD	DBX12.1	FALSE
DSC	DBB14	W#16#0002
DCC	DBD16	DW#16#000000C8

DRUM: Implement sequencer (S7-1500) - STEP 7

FBD (S7-1200, S7-1500)