KEP MMI-1500 Installation & Operation Manual page 51

Aux. Station: Used when PLCs have a node or station identifier. The HMI needs the station number to initiate
communications. Set as needed or leave at 0 if not used. Station numbers are 0-255 (Use the range as appropriate for PLC
type). If the PLC station number does not match the PLC, the "PLC no response" error message is displayed.
Aux. time out constant (sec): This setting determines how long the HMI waits for a response from the PLC. The range is
from 0 to 127 seconds. This setting is important when the PLC is normally slow to respond or several MMIs are linked to one
PLC.
Note: When communications are broken, the red COM LED on the front Panel of the HMI flashes at this interval.
Aux. block pack: Used to determine how the unit communicates to the controller. By increasing this number, larger blocks
of registers can be fetched from the controller. In some cases, this speeds the update of information on the display. The
range is 0 to 255.
Note: Setting the Block Pack to 0 allows the HMI to determine the block size that best fits data retrieval. This is the
recommended setting.
Note: Certain PLCs have a limit as to how many data points can be uploaded at a time. If the Block pack number is set
higher than this limit, it may effect communications.
Hint: When creating project windows, it is advised to use consecutive registers whenever possible.
43