KEP MMI-1500 Installation & Operation Manual page 40

HMI-HMI link speed: This is used only when a Serial interface is used for connecting multiple HMIs. Higher communication
rates may cause faster window updates, but are diminished quicker by link distance and electrical interference.
Note: All linked HMIs must be set to the same link speed. Slave units ignore the communication parameters associated with
the PLC (Serial port I/F, Baud rate, Parity, etc.).
Ethernet IP settings: These settings are used whenever Ethernet communications is selected for Multiple HMI or HMI to
PLC connections. A working knowledge of TCP/IP networking and terminology is necessary to implement Ethernet
connections.
Setting
HMI Local IP address
Server IP address
Subnetwork Mask
Default Route IP address
PLC time out constant (sec): This setting determines how long the HMI waits for a response from the PLC. The range is
from 0.1 to 25.5 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.
PLC 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 has no effect on communications.
Hint: When creating project windows, it is advised to use consecutive registers whenever possible.
Note: Some of the project's System Parameter/PLC Tab settings are stored in the retentive memory of the MMI. See the
System Bit and Register Reference section for further details.
Description
These fields are the IP address of the HMI unit.
The IP address of the PLC or Slave HMI.
The mask for the network where the HMI and PLC or Slave are located.
This is used for HMI to PLC communications. It refers to network server IP settings.
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