Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 18)

LlNKing Files
Table 5 -
LlNKing to
Another File.
The Series 920 enables you to link files together. The LINK step allows you to link the
last step of a profile to the first step of another profile.
Lets edit the program again by adding a LINK step at the end of the profile. But first,
lets create another file. If you run your program with a LINK going to a non-existing file,
you’ll receive ER2 0036, the “no file found“ error. Follow Table 5 to add a LINK and a
new FILE to your program.
FILE? STEP STEP SP HOUR MIN SEC EVl EV2 FILE?
# TYPE
1 8 LINK .._ 5
5 1 SETPOINT . 0 50.. O N ON
5 2 SETPOINT 175 0 0 20 ON ON
5. 3
SETPOINT 100 0 1 15 ON
O F F
5 4
SETPOINT 100 0 0 10 ON OFF
5 5 SETPOINT 75 0 0 25
OFF OFF
5 6
STOP
Run your program again beginning at FILE 1, STEP 8. Step through the menu to see
the step type you’re on, and time remaining. See what happens at the
end of File 1.
The WAITFOR Step
Table 6 -
The WAITFOR Step.
FILE STEP STEP WPV WHR WMN
#
N P E
5 6
75 -
5 7 STOP
The last step type we will work with is the WAITFOR step. This is a test step. It com-
pares a specified temperature with the process temperature, before continuing the
program. It also waits for programmed time to elapse before continuing with the pro-
gram. After the test is successful, the program continues to the next sequential step.
Return to PROGRAM and enter FILE? (5). Add a WAITFOR step to the end
of that file.
WHR and WMN are unprogrammed. To program a WAITFOR time, enter your values
for WHR and WMN. The programmed WAITFOR time waits that time duration. Both
WAITFOR process variable (WPV), and time (WHR,WMN) can be programmed simul-
taneously. Once a WAITFOR condition is satisfied, it won’t have to be performed again.
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Run your program from FILE 5, STEP 1. If you don’t want to go through the entire
program, START your program at any STEP in FILE 1 or 5. When the program reaches
FILE 5, STEP 6, the HOLD LED begins flashing. This means the program is still
running, but is HOLDing, to WAITFOR the ACTUAL temperature to equal the
WATLOW Series 920 User’s Manual Sample Proqram Chapter 3