Ch06_Basic_Function.pdf

Chapter 6 Basic Function Instruction

T …………………………………6-2

C …………………………………6-5

SET …………………………………6-8

RST …………………………………6-10

0 ： MC …………………………………6-12

1 ： MCE …………………………………6-14

2 ： SKP …………………………………6-15

3 ： SKPE …………………………………6-17

4 ： DIFU …………………………………6-18

5 ： DIFD …………………………………6-19

6 ： BSHF …………………………………6-20

7 ： UDCTR…………………………………6-21

8 ： MOV …………………………………6-23

9 ： MOV ／ …………………………………6-24

10 ： TOGG …………………………………6-25

11 ： ( ＋ ) …………………………………6-26

12 ： ( － ) …………………………………6-27

13 ： ( ＊ ) …………………………………6-28

14 ： ( ／ ) …………………………………6-30

15 ： ( ＋ 1) …………………………………6-32

16 ： ( － 1) …………………………………6-33

17 ： CMP …………………………………6-34

18 ： AND …………………………………6-35

19 ： OR …………………………………6-36

20 ： →BCD…………………………………6-37

21 ： →BN …………………………………6-38

6 - 1

Basic Function Instruction

TIMER

Symbol

Operand

Tn: Timer Number.

PV: Preset value of the timer.

TB: Time Base (0.01S, 0.1S, 1S)

Range

WX WY WM

WS TMR CTR HR

SR ROR DR

∣

32767

Tn ○

PV ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

WX0

∣

WX240

WY0

∣

WY240

WM0

∣

WM1896

WS0

∣

WS984

∣

T255

∣

C255

∣

R3839

R3840

∣

R3903

R3904

∣

R3967

R3968

∣

R4167

R5000

∣

R8071

∣

D4095

● The total number of timers is 256 (T0 ～ T255) with three different time bases, 0.01S, 0.1S and 1S.The

default number and allocation of timers is shown as below (Can be adjusted according to user’s actual

requirements by the “Configuration” function):

T0 ～ T49 ： 0.01S timer （ default as 0.00 ～ 327.67S ）。

T50 ～ T199 ： 0.1S timer （ default as 0.0 ～ 3276.7S ）。

T200 ～ T255 ： 1S timer （ default as 0 ～ 32767S ）。

● FBs-PLC programming tool will lookup the timer’s time base automatically according to the “Memory

Configuration” after the timer number is keyed in. Timer’s time = Time base x Preset value. In the example

1 below, the time base T0 = 0.01S and the PV value = 1000, therefore the T0 timer’s time = 0.01S x 1000 =

10.00S.

● If PV is a register, then Timer’s time = Time base x register content. Therefore, you only need to change

the register content to change the timer’s time. Please refer to Example 2.

※ The maximum error of a timer is a time base plus a scan time. In order to reduce the timing error in the

application, please use the timer with a smaller time base.

Description

● When the time control “EN” is 1, the timer will start timing (the current value will accumulate from 0) until

“Time Up” (i.e. CV ≧ PV), then the Tn contact and TUP (FO0) will change to 1. As long as the timer control

“EN” input is kept as 1, even the CV of Tn has reached or exceeded the PV, the CV of the timer will

continue accumulating (with M1957 = 0) until it reaches the maximum limit (32767). The Tn contact status

and flag will remain as 1 when CV ≧ PV, unless the “EN” input is 0. When “EN” input is 0, the CV of Tn will

be reset to 0 immediately and the Tn contact and “Time Up” flag TUP will also change to 0 (please refer to

the diagram c below).

● If the FB S -PLC OS version is higher than V3.0 (inclusive), the M1957 can be set to 1 so the CV will not

accumulate further after “Time Up” and stops at the PV value. The default value of the M1957 is 0,

therefore the status of M1957 can be set before executing any timer instruction in the program to

individually set the timer CV to continue accumulating or stop at the PV after “Time Up” (please refer to the

diagram d below).

6-2

Ope-

rand

Basic Function Instruction

TIMER

Example 1 Constant preset value

Ladder diagram

Key operations

Mnemonic code

.01S

ORG

ORG X 1

1000

TUP

T0 PV: 1000

SET M1957

.01S

FO 0

OUT Y 0

ORG SHORT

SET M 1957

ORG X 1

T1 PV: 1000

1000

TUP

OUT

ORG

An example of taking

“Time-Up” signal directly

from FO0.

ORG

327.67S

32767

10.0S

(CV)

1000

M1957=0

(Defaulted)

1000

(CV)

M1957=1

Time Start

Time-Up

Example 2 Variable PV

The preset value (PV) shown in example 1 is a constant which is equal to 1000. This value is fixed and can not

be changed once programmed. In many circumstances, the preset time of the timers needs to be varied while

PLC running. In order to change the preset time of a timer, can first use a register as the PV operand (R or WX,

WY...) and then the preset time can be varied by changing the register content. As shown in this example, if set

R0 to100, then T becomes a 10S Timer, and hence if set R0 to 200, then T becomes a 20S Timer.

6-3

Basic Function Instruction

TIMER

Ladder diagram

Key operations

Mnemonic code

.1S

ORG X 1

T50

R 0

TUP

T 50 PV: R 0

T50

ORG T 50

An example of applying

the “time-up” status by

using the T50 contact.

OUT Y 0

200

100

T50

(current value)

When R0=100

10.0S

When R0=200

20.0S

Time Start

Time-Up

Remark: If the preset value of the timer is equal to 0, then the timer's contact status and FO0 (TUP) become 1

("EN" input must be at 1) immediately after the PLC finishes its first scan because "Time-Up" has

occurred. (TUP) stays at 1 until "EN" input changes to 0.

6-4

Basic Function Instruction

COUNTER

（ 16-Bit: C0 ～ C199 ， 32-Bit: C200 ～ C255 ）

Symbol

Operand

Cn: The Counter number

PV: Preset value

Range

WX WY

WS TMR CTR HR

SR ROR DR

Ope-

rand

∣

2147483647

Cn ○

PV ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

WX0

∣

WX240

WY0

∣

WY240

WM0

∣

WM1896

WS0

∣

WS984

∣

T255

∣

C255

∣

R3839

R3840

∣

R3903

R3904

∣

R3967

R3968

∣

R4167

R5000

∣

R8071

∣

D4095

● There are total 200 16-Bit counters (C0~C199). The range of preset value is between 0~32767. C0~C139

are Retentive Counters and the CV value will be retained when the PLC turns on or RUN again after a

power failure or a PLC STOP. For Non Retentive Counters, if a power failure or PLC STOP occurs, the CV

value will be reset to 0 when the PLC turns on or RUN again.

● There are total 56 32-Bit counters (C200~C255). The range of the preset value is between 0~2147483647.

C200~C239 are Retentive Counters and C240~C255 are Non Retentive Counters.

● The default number and assignment of the counters are shown below, if necessary can use the

"CONFIGURATION" function to change the settings.

● To insure the proper counting, the sustain time of input status of CLK should greater than 1 scan time.

● The max. counting frequency with this instruction can only up to 20Hz, for higher frequency please use the

high-speed soft/hardware counter.

Description

● When "CLR" is at 1, all of the contact Cn, FO0 (CUP), and CV value of the counter CV are cleared to 0 and

the counter stops counting.

● When "CLR" is at 0, the counter is allowed to count up. The Counter counts up every time the clock "CK ↑ "

changes from 0 to 1 (adds 1 to the CV) until the cumulative current value is equal to or greater than the

preset value (CV>=PV), the counter "Count-Up" and the contact status of the counter Cn and FO0 (CUP)

changes to 1. If the input status of clock continues to change, even the cumulative current value is equal

and greater than the preset value, the CV value will still accumulate until it reaches the up limit at 32767 or

2147483647. The contact Cn and FO0 (CUP) stay at 1 as long as CV>=PV unless the "CLR" input is set to

1. （ please refer the diagram c below ）。

● If the FB S -PLC OS version is higher than V3.0 (inclusive), the M1973 can set to 1 so the CV will not

accumulate further after “Count Up” and stops at the PV. M1973 default value is 0, therefore the status of

M1973 can be set before executing any counter instruction in the program to individually set the counter

CV to continue accumulating or stops at the PV after “Count Up” (please refer to the diagram d below).

6-5

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: