IGS-NT Communication Guide
45
Note: The communication port for Modbus TCP is 502.
Note: Ethernet Modbus/TCP connection is available for all mentioned controllers via Ethernet - MODBUS (IB-
NT) (page 43).
Number of clients connected simultaneously
1 client ModBus TCP/IP
Ethernet connection settings
Perform the connection settings the same way as for Ethernet connection (Direct) (page 27).
Equipment
Equipment needed
Controllerside -
Connection
Ethernet cable (page 85) to LAN, for point to point connection between PC and
controller use cross-wired cable
PC side ETHERNET connection
For more informations about ModBus implementation to ComAp controllers see Modbus Communication on
page 90.
6 back to Applications overview
3.5 Access to password protected objects
Dedicated communication objects are setpoints and commands that are protected by a password against
writing. The set of protected objects is given in the controller configuration and is fixed for a particular controller.
In IG/IS-NT controllers it is possible to specify access levels to protected objects for 8 different users. For each
user a set of access attributes is defined and each of them has his password. The user can gain the right for
writing to 8 groups of objects with different access levels by entering his password. The objects are assigned
into groups in the controller configuration. For example setpoints in the ProcessControl group can be configured
in GenConfig on Setpoints card:
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