Month: October 2026

The IEC 60870-5-104 Server functionality supported by the module includes: 

 The IEC 60870-5-104 communication driver is built in accordance to the approved 

IEC specification 

 The module functions as a Server on the network supporting data read/write 

commands from an IEC 60870-5-104 client on the network 

 One TCP server socket 

 Supports unsolicited messages, either cyclic or spontaneous (cyclic rate is 

configurable) 

 Supports clock synchronization commands from client or from the ControlLogix 

processor 

 Supports Group interrogation (Global, General 1 to 16, Global Counters, Counters 

1 to 4) 

 Event timestamping configurable by type (None, 24 bit, 56 bit) 

 Event queue supports 99 points for each data type 

 Optional user defined list of acceptable client host IP addresses 

 Configurable Common ASDU address (sector) and Information Object Address 

 An IEC Interoperability Document for the MVI56 is available which fully documents 

data types supported by the module

General specifications include:

 User-definable database memory usage, based on data types and point counts

 Protocol implementation conforms to the IEC 60870-5-104 specification with fully-configurable

parameters

 SNTP (Simple Network Time Protocol) timestamping for detailed logging of data transactions (events)

IEC 60870-5-104 Server Specifications 

Operating in the Server mode, the module accepts commands from a Client(s) to 

read/write data stored in the module’s internal registers. This data is easily and 

continuously transferred between the MVI56-104S, Edition 2 module and the 

ControlLogix processor’s data registers. 

General Specifications – 104S

Operating in server mode (only), the 104S protocol implementation accepts commands

from an IEC-60870-5-104 Client to read data stored in or write data into the gateway’s

internal database memory registers. The 104S implementation is also capable of generating

unsolicited messages. Unsolicited messages can be either spontaneous (event-driven) or

cyclic (timing-driven) communication.

The remote Client device uses the fully-configurable gateway memory database to control

outputs and monitor inputs to devices on the

IEC 104 network.  Changes to the gateway database can also be used to transfer monitoring

and control data to devices connected to

the gateway using another installed network protocol. The 104S gateway thus provides a data

transfer solution between an IEC 60870

5-104 Ethernet network and other serial and Ethernet network protocols, as well as proprietary interfaces.

The MVI56 IEC 60870-5-104 Server Communication Module allows

ControlLogix compatible processors to interface easily with IEC 60870-5

104 protocol-compatible hosts.

The MVI56-104S module acts as an input/output module between the IEC

60870-5-104 Ethernet network and the ControlLogix processor. Data

transfer between the module and the processor is asynchronous from the

actions on the network. Databases are defined by the user for the module to

hold data as required by the protocol.

General Specifications

 Single Slot – 1756 backplane-compatible

 The module is recognized as an Input/Output module and has access to

processor memory for data transfer between processor and module.

 Ladder Logic is used for data transfer between module and processor.

Sample ladder file included.

 Configuration data obtained from configuration text file downloaded to module. 

Sample configuration file included

 Local or remote rack

Features and Benefits

GE Fanuc Automation and GE Drive Systems developed an Ethernet

Global Data, or EGD, exchange for PLC and computer data in 1998.

Ethernet Global Data (EGD) offers versatility where a mix of control

devices requires cooperation with each other. This involves sharing

of information across the applications regardless of device or network

type, often at high speed, and with high reliability. High reliability

means fewer communication failures and having the ability to detect

failures upon occurrence. Particular emphasis is delivered for

applications requiring periodic or frequent updates and time

synchronization of devices. The protocol supports Unicast, Broadcast

and Multicast group messaging. Efficiency is based on the fact each

device on the network can produce these types of messages and

each device determines which of these messages to consume.

MVI56-EGD

The Ethernet Global Data (EGD) module can be used to interface

many different protocols with EGD devices. The EGD driver supports

both the producer/consumer service port (18246) and the command

service port (7937) using the UDP protocol over an IP network. The

user defines the data to be produced and consumed in a

configuration file downloaded to the module.

General Specifications

• Single Slot – 1756 backplane compatible

• The module is recognized as an Input/Output module and has

access to processor memory for data transfer between

processor and module

• Ladder Logic is used for data transfer between module and

processor. Sample ladder file included.

• Configuration data obtained from configuration text file

downloaded to module. Sample configuration file included

• Local or remote rack

Functional Specifications

 Support for the storage and transfer of up to 150 valves to the ControlLogix

processor’s controller tags

 Emulates Limitorque’s Port A/B polling scheme using both ports on the module

 Supports the following valves

o MX/DDC Modbus

o UEC-3-DDC Modbus

o DDC-100M I/O module

o DDC-100M field unit

o Valvcon IVO (unit in multi-drop mode only)

 Software configuration

o Baud rate: 1200 to 115200

o Message response timeout

o Number of active slaves

o Last state on communication failure for valve data

o Network polling scheme

o Active slave table (bit mapped)

o Use of CTS module line option

 Support command

o Continuously polled

o Read registers 40008 to 40013. optional 40055 or 40006/40007

o Commands: open, stop, close, initiate network ESD, terminate network ESD,

engage contactors 1 to 6. disengage contactors 1 to 6. position valve (0 to 100%)

 Data returned to the processor for each valve

o Valve position

o Status register

o Fault register

o Digital outputs

o Digital inputs registers 1 and 2

o Communication error code

o Communication poll counter

o Special polled registers