Datasheet

Modbus TCP Communication HIMA H41q/H51q ↔

↔↔

↔ Emerson DeltaV

Note 1:

Variables defined as Import/Export use separate addresses for reading and for

writing, according to Modbus conventions. Thus an Import/Export variable reserves

twice as much memory space as an equivalent Export or Import variable.

Import/Export addresses must be projected in both (read and write) memory areas.

Boolean variables can be made an event by checking the Event check box beneath the “Event

handling” tab. Like with BUSCOM variables you can also declare specific addresses under which the

event should be communicated.

Note 2:

If you define a spare range of communication addresses it is not necessary to

download the H41q/H51q when adding new communication variables or events

instead you can proceed with a reload of the PES. You can achieve this by inserting a

dummy communication variable or event some addresses ahead of the actually used

range.

2.3. Configuration of DeltaV Hard- and Software

The necessary configuration of the DeltaV DCS for Modbus TCP communication consists of the

configuration of the ethernet communication module Mynah VIM, the simulated DeltaV serial cards

and of the take-over of the communicated data in the application software of the DeltaV control

modules.

2.3.1 VIM Configuration

The Mynah VIMs are installed next to the DeltaV 2-wide controller carrier on the left side. They are

mounted, together with a standard DeltaV power supply, on a separate 2-wide controller carrier.

Note 3:

If necessary due to mounting space restrictions the 2-wide DeltaV controller and VIM

carriers can be separated from the 8-wide DeltaV IO carriers by using extender sets

which separate the carriers by means of special signal cables and extender modules.

Two standard ethernet Layer 2 switches are used as network nodes for Modbus TCP communication

in the primary and secondary network. These switches are also certified for use with HIMA´s safe

communication via safeethernet to other H41q/H51q PES and they can also be used if additional

OPC DA or OPC A&E Servers need to be used.

Note 4:

The Mynah VIMs require the use of two switches as coupling devices for redundant

connections because the VIMs need a cross link cable between these switches

(marked in red in Figure 2.1) to carry out their redundancy replication. Also for a

redundant direct point-to-point connection (one DeltaV controller communicating to

one HIMA PES) crossed network cables cannot be used. Instead two switches and a

cross link cable between them are required.