ALTUS Nexto NX3004 User Manual

4. Configuration
68
Limitations
MODBUS RTU
Master
MODBUS RTU
Slave
MODBUS Ethernet
Client
MODBUS Ethernet
Server
Maximum number
of mappings per
instance
128
32
128
32
Maximum number
of devices
64
1
64
1
Maximum number
of mappings per
device
32
32
32
32
Maximum number
of simultaneous
requests per
instance
-
-
128
64
Maximum number
of simultaneous
requests per
device
-
-
8
64
Table 4-25. MODBUS Protocol Limitations for Direct Representation
Notes:
Devices per instance:
 Master or Client Protocols: number of slaves or server devices supported by each Master or
Slave protocol instance.
 MODBUS RTU Slave Protocol: the limit
(1)
informed relates to serial interfaces that do not
allow a Slave to stablish communication through the same serial interface, simultaneously, with
more than one Master device. It’s not necessary, nor is it possible to declare or configure the
Master device in the instance of the MODBUS RTU slave protocol. The master device will have
access to all the mappings made directly on the instance of MODBUS RTU slave protocol.
 MODBUS RTU Server Protocol: the limit
(2)
informed relates to the Ethernet interfaces, which
limit the number of connections that can be established with other devices through a single
Ethernet interface. It is not necessary, nor is it possible to declare or configure Clients devices in
the instance of the MODBUS Server protocol. All Clients devices will have access to all the
mappings made directly in the instance of the MODBUS Server protocol.
Mappings per device: The maximum number of mappings per device, despite being listed above, is
also limited by the protocol maximum number of mappings. Also to be considered the maximum
CPU mappings as in Table 4-24.
Simultaneous Requests per Instance: Number of requests that can be simultaneously transmitted
by each Client protocol instance or that can be received simultaneously by each Server protocol
instance. MODBUS RTU protocol instances, Master or Slave, do not support simultaneous requests.
Simultaneous Requests per Device: Number of requests that can be simultaneously transmitted to
each MODBUS Server device, or may be received simultaneously by each MODBUS client device.
MODBUS RTU devices, Master or Slave do not support simultaneous requests.

ALTUS Nexto NX3004 Specifications

General

Brand	ALTUS
Model	Nexto NX3004
Category	Processor
Language	English