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Model 922-MES – User Manual
8.4.8 Multiple Modbus Clients
The MES card provides support for up to four Modbus clients. This feature allows the user to establish more
than one Modbus TCP/IP connection to the same card. When more than one connection is established to the
card, some packet collisions and re-transmission are expected. In general, when using multiple TCP connections
to the same card, it is recommended to set the Modbus poll rate to a value greater than 1 second.
8.4.9 IP Settings for Diagnostics (uC DIAG)
The MES card includes an IP validation feature in the Telnet interface. This feature checks for a valid IP and
subnet combination. If an invalid IP Address is entered using the "set ip" command, the Telnet interface will
show the user the valid range of IP addresses within the current subnet. Additionally, subnet validation will
ensure that the user is providing a valid subnet when using the "set subnet" command. Examples of an
invalid IP entry, a valid IP entry and an invalid subnet entry can be seen in the following figures.
IP validation also occurs during the startup procedure. If on startup an invalid IP address or subnet is read
from the EEPROM, these parameters will be set to the factory defaults.
Figure 8-1: Telnet Invalid IP Entry
Figure 8-2: Valid IP Entry
Figure 8-3: Invalid Subnet Entry
Focal Technologies Corporation
Page 8-8
A Moog Inc. Company
Document No. 922-0662-00, Rev 1.0
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