Campbell-scientific CR10X Measurement and Control System Manual de usuario descargar pdf (Pagina 186)

SECTION 12. PROGRAM CONTROL INSTRUCTIONS

12-4

The Loop with a delay may be used so that only

those instructions within the Loop are executed

while certain conditions are met. As a simple

example, suppose it is desired to execute one

set of instructions from midnight until 6 AM,

another set between 6 AM and 4 PM, and a

third set between 4 PM and midnight. Between

6 AM and 4 PM, samples are desired every 10

seconds; the rest of the time one minute

between samples is sufficient. The execution

interval is set to 10 seconds; when a one minute

sample rate is desired, a delay of 6 (6 x 10s =

60s) is used in the loop.

TABLE 12-4. Example: Loop with Delay

* 1 Table 1 Programs

01: 10 Sec. Execution Interval

01: P87 Beginning of Loop

01: 6 Delay

02: 0 Loop Count

11: P86 Do

01: 1 Call Subroutine 1

12: P89 If X<=>F

01: 25 X Loc DAY

02: 3 >=

03: 6 F

04: 31 Exit Loop if true

13: P95 End

14: P87 Beginning of Loop

01: 1 Delay

02: 0 Loop Count

27: P86 Do

01: 1 Call Subroutine 1

28: P89 If X<=>F

01: 25 X Loc DAY

02: 3 >=

03: 16 F

04: 31 Exit Loop if true

29: P95 End

30: P87 Beginning of Loop

01: 6 Delay

02: 0 Loop Count

36: P86 Do

01: 1 Call Subroutine 1

37: P89 If X<=>F

01: 25 X Loc DAY

02: 3 >=

03: 5 F

04: 32 Exit Loop if false

38: P95 End

39: P End Table 1

* 3 Table 3 Subroutines

01: P85 Beginning of Subroutine

01: 1 Subroutine Number

02: P18 Time

01: 2 Hours into current year

(maximum 8784)

02: 24 Mod/by

03: 25 Loc [:DAY ]

03: P95 End

*** 88 IF X COMPARED TO Y ***

FUNCTION

This Instruction compares two input locations

and, if the result is true, executes the specified

Command. The comparison codes are given in

Table 12-5.

PARAM. DATA

NUMBER TYPE DESCRIPTION

01: 4 Input location for X

02: 2 Comparison code

(Table 12-5)

03: 4 Input location for Y

04: 2 Command (Table 12-2)

TABLE 12-5. Comparison Codes

Parameter 1 Function

1IF X = Y

2IF X ≠Y

3IF X ≥ Y

4IF X < Y

*** 89 IF X COMPARED TO F ***

FUNCTION

This Instruction compares an input location to a

fixed value and, if the result is true, performs

the specified Command. The comparison codes

are given in Table 12-5.

PARAM. DATA

NUMBER TYPE DESCRIPTION

01: 4 Input location for X

02: 2 Comparison code

(Table 12-5)

03: FP Fixed value

04: 2 Command (Table 12-2)

1 2 ... 181 182 183 184 185 186 187 188 189 190 191 ... 361 362

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Campbell-scientific CR10X Measurement and Control System Manual de usuario Pagina 186

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