Manual

Technical Reference
Press to light CHG DATA LED.
Press to select the Step Type you want:
SP, JL, VVT or NX.
Press enter to select individual prompts.
Press to select values.
Figure 20 -
CHG DATA Mode
Flow Diagram
Press to enter data into memory.
Series 1500 Displays
STEP
FUNCTION
LA
DATA
I
= Blank Display
m = Step Number
W 1-1 = Next Step
in Sequence
0
= Sl
0
= S2
0
8 E1
0
* E2
m HR
0
8 MN
0
l SC
lzlm
0
* NX
3
I
0
= JS
0
l JC
+Fl NX
W1 0
W2 0
WE 0
WH 0
Q
WS 0
NX [-y-J
-t
For the WT (Wait) submode, do this: With SP displayed, press FCTN until WT
appears.
Press ENTER and Wl comes up requesting a wait condition for the Ch-
1 set point. Enter a value and press ENTER. If no wait for Ch-1 set point is
needed, press FCTN. Now, W2 appears requesting a wait for Ch-2 set point.
After W2, WE, WH (Wait for Real Hours), then WM (Wait for Real Minutes), then
WS (Wait for Real Seconds ) will appear in sequence. Select actual time-of-day
values for each and press ENTER.
The Blank Step
Any unprogrammed step is first a Blank Step before information entered makes it a
Set Point, Jump Loop, or Wait Step.
A Blank Step halts the processor.
When it encounters a Blank Step at the end of a
program, the processor will always halt unless you selected the RECYCLE option in
the CHG PARA mode. In that case, the program returns to Step 01 and repeats. The
0001 entry option at the RC prompt in Guarded Access selects the recycle option.
In normal programming, only the last step in the program remains a Blank step.
Therefore, you retain a Blank Step simply by not programming the step.
Halt Conditions
The Series 1500 can HALT in three ways. It encounters a Blank Step in a program (a
Blank Step hatts the Series 1500) you press the RUN/HALT key while a program is
running, or the remote hold input is shorted.
42
While in the HALT condition, the Series 1500 actively maintains the Set Points and
Event Output conditions which existed at the time it hatted.
WATLOW Series 1500 User's Manual
Programming, Chapter 4