[Delta DVP16SP11R expansion module](https://www.automation24.ir/product-652/%D9%85%D8%A7%DA%98%D9%88%D9%84-%D8%AA%D9 %88%D8%B3%D8%B9%D9%87-%D8%AF%D9%84%D8%AA%D8%A7-dvp16sp11r)
Development module (development card):
Since all the needs of a system cannot be realized in the PLC itself, as a result, PLC manufacturers introduce expansion modules to expand the productivity of the PLC controller. These modules are classified depending on the inputs and outputs that enter or exit the PLC.
## Basically, there are two types of output and input in the PLC controller.
Analog input and output
Digital input and output
Based on this, some development modules are made as analog and others as digital. The analog module can be divided into analog input modules and analog output modules.
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It can also be said about the development modules that some of them have the ability to be networked and some others must be connected to the PLC as an extension to be able to use them. Analog development modules are made in the number of different channels, as well as digital modules in the number of input and output. Also, some digital modules form a combination of input and output.
For example, the 16SN Delta module is a module that provides 16 digital outputs to the user, or the 16SM module is a module that provides 16 digital inputs, or the 16SP module is a module that provides 8 digital outputs and 8 inputs. provides digital to the user.
Modules that have the ability to be networked can be installed at a further distance and connected to the PLC with the RS-485 network.
### Things to consider when buying a development module:
1. Module type (analog-digital)
2. Number of channels for analog modules
3. Number of inputs and outputs for digital modules
4. Ability to network
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