Emerson Unidrive M700 - Page 87

SI-Ethernet User Guide 87
Issue: 1
Safety
information
Introduction
Mechanical
installation
Electrical
installation
Getting started Parameters
Key features
and Protocols
PC Applications Security Diagnostics
Glossary of
terms
Index
The priority connections are permanent and, once made will only be deleted at the
request of the client or due to a communications error.
Any connections not in the priority connections pool are kept in the non-priority
connections pool. If a client attempts to establish a priority connection and all available
non-priority connections are in use, the non-priority connection that has not been used
for the longest will be closed to make way for the new priority connection.
This parameter defines the maximum number of priority connections that any one client
can establish. This check is only performed on the connections in the priority
connections pool.
This parameter defines the time period in which the Modbus server must receive a
message before any specified action (as defined in Modbus Timeout Action (S.15.010))
is performed. When the timeout occurs, bit 2 in the module's alarm parameter (Active
Alarm Bits (S.00.009)) will be set and the specified action will be performed.
The timeout is enabled when the server receives its first message.
S.15.008 Maximum Priority Connections Per Client
Minimum 1 Maximum 4
Default 2 Units
Type 8 Bit User Save Update Rate
Module reset, Modbus
interface reset or Modbus
interface enable
Display Format None Decimal Places 0
Coding RW, BU
S.15.009 Modbus Timeout
Minimum 1 Maximum 10000
Default 100 Units ms
Type 16 Bit User Save Update Rate
Module reset, Modbus
interface reset or Modbus
interface enable
Display Format None Decimal Places 0
Coding RW, BU
It is good system design to allow for some message loss by setting the timeout duration
to be greater than the transmit period by a factor of 2 or more.
S.15.010 Modbus Timeout Action
Minimum 0 Maximum 1
Default 1 Units
Type 8 Bit User Save Update Rate
Module reset, Modbus
interface reset or Modbus
interface enable
Display Format None Decimal Places 0
Coding RW, TE, BU
NOTE