E-2
RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
to expect 692 degrees at 25 volts (the maximum input with the voltage divider input on).
Assuming you are using analog input 1, the command would be:
Command 102 1 0 0000 0 0692 <unkey>
Now try reading the direction with the macro you wrote in the previous step. It should read
0 degrees with the rotor all of the way CCW, 180 degrees at north, and 360 degrees with
the rotor all of the way CW. If it is off slightly, adjust the 692 used in Command 102 to
make it line up. Increase it if the readings are too large and decrease it if the readings are
too small. Do not change the analog conversion ratio after you finish this step or you will
mess up any presets you have made.
• Now we will set an analog low alarm at the most CCW position. Turn the rotor all of the
way CCW. Read the direction. It should be 0 degrees (or close to it). To set the analog
alarm (again assuming analog input 1):
Command 104 1 0 0 0000 D or unkey
When that low alarm occurs, we want it to turn the rotor motor off. Double check to make
sure you remember the command number of the macro you wrote in the first steps to turn
the motor off. We will use command number 172 for this example, you can use the number
of your macro. When the alarm occurs, it will call an analog low alarm macro. You can
find the appropriate macro number in Chapter 8 in the automatic macro section. We will
assume you are using macro number 183. We want this macro to turn the rotor off, so we
will make it call the rotor off macro:
Command 053 183 172 <unkey>
• You can test the alarm we set in the above step by executing the motor CCW macro we
made and making sure that it turns itself off when it gets to the CCW limit. The RLC-4
checks the alarm every second by default, but you can speed it up if you want to. Simply
change the "I/O Polling Timer" with command C020. A reset value of 10 (100 milliseconds
= 1/10 of a second) is probably more than fast enough.
• We will also want to turn the rotor off when a analog high alarm occurs, so we will program
the analog high alarm macro (number 276) to do the same thing as the analog low alarm
macro:
053 276 172 <unkey>
• Now we are ready to make a preset. We will use a macro to set the analog high alarm for
the proper position and turn the rotor on in the clockwise direction. When it gets to the
alarm point, it will turn itself off. Turn the rotor to a direction you would like to make a
preset for. Read the direction with the macro we wrote earlier and write down the reading.
Now program a macro to contain two commands: first set the analog high alarm to the
direction reading you just wrote down, then call the motor CW macro. In the following
example, the macro number will be signified by MMM, the analog line will be assumed to be
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