Foxboro P0917MF output card



Category: SKU: P0917MF Tag:
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Sixteen Contact Sense Discrete Inputs connect to sixteen DeltaV DI CHARMs – termination assembly model numbers FBM207b / P0916JS and FBM207c / P0917MF.


The selection of PLC should mainly be comprehensively considered from the aspects of PLC model, capacity, I/O module, power module, special function module, communication networking ability, etc.

Selection of PLC model
The basic principle for selecting PLC models is to strive for the best performance price ratio while meeting functional requirements and ensuring reliability and easy maintenance. When choosing, the main considerations are as follows:
(1) Reasonable structural type
PLC mainly has two structural types: integrated and modular.
The average price of each I/O point in an integrated PLC is cheaper than that of a modular PLC, and its volume is relatively small. It is generally used in small control systems with relatively fixed system processes; The modular PLC has flexible and convenient function expansion, with a wide range of options in terms of I/O points, the ratio of input points to output points, and the types of I/O modules. It is also easy to maintain and is generally suitable for more complex control systems.

(2) Selection of installation method
The installation methods of PLC systems are divided into centralized, remote I/O, and distributed networks of multiple PLCs.
Centralized does not require the installation of remote I/O hardware, resulting in fast system response and low cost; Remote I/O mode is suitable for large systems, with a wide range of device distribution. Remote I/O can be installed dispersedly near on-site devices with short connections, but additional drivers and remote I/O power supplies are required; The distributed networking of multiple PLCs is suitable for situations where multiple devices are independently controlled and interconnected. Small PLCs can be selected, but additional communication modules are necessary.

(3) Corresponding functional requirements
Generally, small (low-end) PLCs have functions such as logic operation, timing, counting, etc., which can be met for devices that only require on-off control.
For systems with switch based control and a small amount of analog control, an enhanced low-end PLC with A/D and D/A conversion units, as well as addition and subtraction arithmetic operations and data transmission functions, can be selected.
For complex control, it is required to achieve functions such as PID calculation, closed-loop control, and communication networking. Depending on the size and complexity of the control scale, medium or high-end PLCs can be selected. However, mid to high-end PLCs are more expensive and are generally used in large-scale process control and distributed control systems.
(4) Response speed requirements
PLC is a universal controller designed for industrial automation, and the response speed of different grades of PLCs can generally meet the needs of their application range. If you want to use a PLC across different ranges, or if certain functions or signals have special speed requirements, you should carefully consider the response speed of the PLC. You can choose a PLC with high-speed I/O processing function, or a PLC with fast response module and interrupt input module.

(5) Requirements for system reliability
The reliability of general system PLCs can be met. For systems with high reliability requirements, consideration should be given to whether to use redundant systems or hot standby systems.

(6) Try to unify the models as much as possible
A company should strive to achieve uniform PLC models. Mainly considering the following three aspects:
1) The model is unified, and its modules can be used as backup for each other, facilitating the procurement and management of spare parts.
2) The model is unified, with similar functions and usage methods, which is conducive to the training of technical personnel and the improvement of technical level.
3) The model is unified, its external devices are universal, resources can be shared, and it is easy to communicate with the network. After being equipped with an upper computer, it is easy to form a multi-level distributed control system.