Campbell Scientific CR510 CR510 Basic Datalogger - Page 52

Program Control Logical, Constructions

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SECTION 3. INSTRUCTION SET BASICS TABLE 3.7-2. Example of the Use of Flag 9 1: If time is (P92) 1: 0 2: 10 3: 10 2: If (X!F) (P89) 1: 14 2: 4 3: 4.5 4: 19 Minutes (Seconds --) into a Interval (same units as above) Set Ouptut Flag High (Flag 0) X Loc [ Wind_spd ] < F Set Intermed. Proc. Disable Flag High (Flag 9) 3: Histogram (P75) ; See Section 11 for details of this intruction. 4: Do (P86) ; Required when additional output processing follows 1: 29 Set Intermed. Proc. Disable Flag Low (Flag 9) 5: Maximum (P73) 1: 1 2: 00 3: 14 Reps Time Option Loc [ Wind_spd ] As an example, suppose it is desired to obtain a wind speed rose incorporating only wind speeds greater than or equal to 4.5 m/s. The wind speed rose is computed using the Histogram Instruction 75, and wind speed is stored in input location 14, in m/s. Instruction 89 is placed just before Instruction 75 and is used to set Flag 9 high if the wind speed is less than 4.5 m/s: 3.8 PROGRAM CONTROL LOGICAL CONSTRUCTIONS Most of the Program Control Instructions have a command code parameter which is used to specify the action to be taken if the condition tested in the instruction is true. Table 3.8-1 lists these codes. NOTE: Flag 9 is automatically reset the same as Flag 0. If the intermediate processing disable flag is already set high and the test condition of a subsequent Program Control Instruction acting on Flag 9 fails, the flag is set low. This feature eliminates having to enter another instruction to specifically reset Flag 9 low before proceeding to another group of test conditions. 3.7.3 USER FLAGS Flags 1-8 are not dedicated to a specific purpose and are available to the user for general programming needs. The user flags can be manually toggled from the keyboard in the ∗6 Mode (Section 1.3). By inserting the flag test (Instruction 91) at appropriate points in the program, the user can use the ∗6 Mode to manually direct program execution. TABLE 3.8-1. Command Codes 0 1-9, 79-99 10-19 20-29 30 31 32 41 51 61 71 Go to end of program table2 Call Subroutine 1-9, 79-991 Set Flag 0-9 high Set Flag 0-9 low Then Do Exit loop if true Exit loop if false Set Port 1 high Set Port 1 low Toggle Port 1 Pulse Port 1 1 98 is a special subroutine which can be called by Control port 2 going high; see Instruction 85 for details (Section 12). 2 If this command is executed while in a subroutine, execution jumps directly to the end of the table that called the subroutine. 3-4

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SECTION 3.
INSTRUCTION SET BASICS
3-4
TABLE 3.7-2.
Example of the Use of Flag 9
1:
If time is (P92)
1:
0
Minutes (Seconds --) into a
2:
10
Interval (same units as above)
3:
10
Set Ouptut Flag High (Flag 0)
2:
If (X
!
F) (P89)
1:
14
X Loc [ Wind_spd ]
2:
4
<
3:
4.5
F
4:
19
Set Intermed. Proc. Disable Flag High (Flag 9)
3:
Histogram (P75) ; See Section 11 for details of this intruction.
4:
Do (P86) ; Required when additional output processing follows
1:
29
Set Intermed. Proc. Disable Flag Low (Flag 9)
5:
Maximum (P73)
1:
1
Reps
2:
00
Time Option
3:
14
Loc [ Wind_spd ]
As an example, suppose it is desired to obtain a
wind speed rose incorporating only wind speeds
greater than or equal to 4.5 m/s.
The wind
speed rose is computed using the Histogram
Instruction 75, and wind speed is stored in input
location 14, in m/s.
Instruction 89 is placed just
before Instruction 75 and is used to set Flag 9
high if the wind speed is less than 4.5 m/s:
NOTE
: Flag 9 is automatically reset the
same as Flag 0.
If the intermediate
processing disable flag is already set high
and the test condition of a subsequent
Program Control Instruction acting on Flag
9 fails, the flag is set low.
This feature
eliminates having to enter another
instruction to specifically reset Flag 9 low
before proceeding to another group of test
conditions.
3.7.3
USER FLAGS
Flags 1-8 are not dedicated to a specific
purpose and are available to the user for
general programming needs.
The user flags
can be manually toggled from the keyboard in
the
∗
6 Mode (Section 1.3).
By inserting the flag
test (Instruction 91) at appropriate points in the
program, the user can use the
∗
6 Mode to
manually direct program execution.
3.8
PROGRAM CONTROL LOGICAL
CONSTRUCTIONS
Most of the Program Control Instructions have a
command code parameter which is used to
specify the action to be taken if the condition
tested in the instruction is true.
Table 3.8-1 lists
these codes.
TABLE 3.8-1.
Command Codes
0
Go to end of program table
2
1-9, 79-99
Call Subroutine 1-9, 79-99
1
10-19
Set Flag 0-9 high
20-29
Set Flag 0-9 low
30
Then Do
31
Exit loop if true
32
Exit loop if false
41
Set Port 1 high
51
Set Port 1 low
61
Toggle Port 1
71
Pulse Port 1
1
98 is a special subroutine which can be
called by Control port 2 going high; see
Instruction 85 for details (Section 12).
2
If this command is executed while in a
subroutine, execution jumps directly to the
end of the table that called the subroutine.