Troubleshooting Using External Memory Mode - Motion Control Engineering 2000 Manual

Troubleshooting Using External Memory Mode

By using the computer's External Memory mode, it is possible to find out if the controller is
receiving call signals correctly, as well as HC-UIO board input and output signals.
The following example illustrates how to use the Computer External Memory Chart to check a
signal in the computer's external memory.
Example problem: The DHLD (Door Hold Open Switch) input will not cause the doors to stay
open. DHLD is programmed for the Spare 5 input.
1. Find SP5 in the Computer External Memory Chart
of SP5 is 02AF and the Position is 5.
2. Look up the signal on the computer. Change the address on the display to Address 02AF
(see "F2: External Memory Mode" on page
right), which is underlined in the following display:
This digit represents the computer's interpretation of the Spare
5 input signal. If the digit is 1, the computer thinks that the SP5
signal is ON. If the digit is 0, the computer thinks that the SP5
signal is off.
This information can be used to determine the source of the problem. If the Spare 5 input is
programmed for the DHLD (Door Hold) input and the doors are not staying open, the diagnos-
tic display will show that the SP5 input is off. If this is the case, checking the voltage on the SP5
terminal will show whether the problem is inside or outside the controller.
F2: External Memory Mode
(page 5-58). Notice that the Address
5-56). Look at data bit number 5 (from the
EXTERNAL MEMORY
DA.02AF:1OOO1OOO
5
5-57