IC697MDL740 24 to 48V DC Module – GE


IC697MDL740 Technical Specification
Brand: GE Fanuc
Series: 90-70 Series
Rated voltage: 24 to 48 V DC

Category: SKU: IC697MDL740 Tag:
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About IC697MDL740

The GE Fanuc discrete output module that is known as the IC697MDL740 discrete output module is frequently used with programmable logic controllers or PLCs from the GE Series 90-70 product line. The IC697MDL740 discrete output module works well with many GE PLC devices and it has a wide range of features that can contribute to PLC system enhancement and improved machine performance. The IC697MDL740 output module provides 16 outputs that require a voltage range of 20 to 60 Volts DC to operate. The specified current for the output is 2 Amps per point or 4 Amps per every output group. This particular module responds in only 2 milliseconds and its voltage drops less than 1 Volt.


The IC697MDL740 discrete output module has a high inrush capacity which is about 10 times the value of its rated current value. The specified inrush current allows the module to support various loads. This output module includes LED indicators for fuse status and device on-off status updates. All the LED indicators are located on the top of the module. The module also includes a specific keying technology that does not allow for the mounting of incompatible modules. This safety feature can be valuable since every component in the system must meet the needs of the application for which the module is applied. The configuration process of the IC697MDL740 module is simple and it can be done in several ways. All adjustments are performed on a PC that runs the Windows operating system. For additional protection, the module can be purchased with a conformal coating which comes as an optional feature. Other optional features are available from the factory too.

Controller redundancy
The redundancy of distributed processing units can be divided into two types based on redundancy: 1:1 and 1:n. This is different among the products of each DCS manufacturer. Both methods have their advantages and disadvantages. The redundancy setting with a redundancy ratio of 1:1 is introduced here.

The redundancy of the distributed processing unit is 1:1, which means setting two controllers with identical configurations as redundant. When put into operation, if a fault occurs, undisturbed switching can be achieved between the two distributed processing units to ensure the normal operation of the system.

The distributed processing units used in this system are equipped with three network interfaces, two of which are connected to Network A and Network B respectively to achieve data communication between workstations. The third network interface is connected to the sub distributed processing units through peer-to-peer data (peer-to-peer data can now be transmitted using optical fiber as the transmission medium) to transmit backup data between the master and slave distributed processing units; The status information between distributed processing units is transmitted through the serial port.

The working principle of redundant distributed processing units: The hardware configuration of two distributed processing units is identical, with the same operating system and configuration software installed internally,Same configuration information. At the same time, only one distributed processing unit receives process information through a dual machine exchange card and performs computational processing, ultimately generating a control structure to control the process equipment. This distributed processing unit is called the main distributed processing unit. At the same time, the redundant distributed processing unit is not idle. It copies the process information and calculation results received by the main distributed processing unit in real-time through the fiber optic cable between the two machines during each work cycle, so that the redundant distributed processing unit is always synchronized with the main distributed processing unit. The redundant distributed processing unit simultaneously detects whether the copied information is complete and within the allowable fault tolerance. Once the information is incomplete or an error is reported, it indicates that the main distribution processing unit is not working properly. In this case, the redundant distributed processing unit bypasses the main distributed processing unit through optical fibers and switches to the main distributed processing unit to continue working. Select the shortest operating cycle (tens of ms or less) for switching time to achieve undisturbed switching. After the main distribution processing unit returns to normal, the redundant distribution processing unit automatically returns control to the main distribution processing unit and switches to the redundant backup state.

From Figure 3, it can be seen that the working principle of the dual distributed processing unit arbitration circuit is to add the diagnostic results of each distributed processing unit to the arbitration circuit, and read the corresponding arbitration results to determine its own primary and secondary states. By programming, the priority of each state is determined. As the dual distribution processing units determine their respective primary and secondary states based on the arbitration results, as long as the arbitration results change, the dual distribution processing units automatically switch.


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