Maple Systems Inc., 808 134th Street SW, Suite 120, Everett, WA 98204-7333 - www.maplesystems.com
1036-0112 Page 3 of 5 Rev. 02, 04/30/2011
Discrete Memo
ry
The following table lists the controller’s discrete memory ranges that the Maple HMIs are able
to access. Please note that your controller’s memory range may be smaller or larger than that
supported by these HMIs. The following discrete memory is displayable in single-bit format on
the Maple HMI.
(Note: d=decimal)
Readindividual bits in the Status Word
Read/write:
0=Disable;
1=Enable
Read/write
individual output bits
Readonly, individual input bits
Read/write:
0=Actual
Position; 1=Demand Position
Important Memory
Con
sideratio
ns
If your PLC’s memory range is smaller than the range supported by the Maple HMIs, it is possible
to configure the HMI to monitor a PLC memory address which does not exist. Since this can
cause unpredictable results, when you configure the HMI please ensure that all selected PLC
memory addresses are valid for your PLC model.
Do not configure the HMI to write to any PLC memory address that should only be written to
by the PLC itself.
Communication Error Messages
Duringcommunications with the controller, the HMI may display one or more of the
following message.
1. “PLC No Response”: the controller did not respond to the HMI’s request. Possible causes:
Cabling between the HMI and the controller (correct pinout, tight connection, not reversed)
Communications settings (baud rate, parity, etc.)
Controller AXISAddress.
Register availability & correct formatting of bit registers
If an error is reported while trying to set an output, make sure the output is not reserved.
If, after double-checking the above items, the problem has not been resolved, try introducing
some Turn Around delay. Set the Turn Around Delay to a small value (start with 15), and
experiment with increasing values. If there is still no resolution, please call Maple Systems
tech support.
