4-52 Manual # 42-02-2M01 A1
User Interface
F2: External Memory Mode
Access External Memory by placing Function Switch F2 in the Up
position (all others down).
External Memory mode is used to view memory addresses in HC-
MPU board RAM. The external memory address is denoted by the
letters DA (Data Address). Viewing external memory is helpful in
troubleshooting. The Computer External Memory Chart Table lists address data digits and
meanings.
1. Select the address to view. (See following table.)
• Press N to select an address digit (selected digits blink)
• Press + or - to change the blinking digit
2. Press S to select the entered address when ready to view contents (or wait about 20 sec-
onds and the selection will appear by itself).
Example
• The DHLD (Door Hold Open Switch) input is not holding the doors open.
• From your job prints, you see that DHLD is programmed for the Spare 5 input.
1. Find SP5 in the Computer External Memory Chart (page 4-53). Note that the Address of
SP5 is 02AF and the Position is 5.
2. Change the address on the display to Address 02AF. Look
at the data bit at position 5 (from the right - underlined in
illustration) to see the state of the input. If the digit is 1, the
controller sees the SP5 signal as ON. If the digit is 0, the
controller sees the SP5 signal as OFF.
Check the voltage on the SP5 terminal to see whether the problem is in the controller or with
outside components.
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