What is an Omron NX Power Module and Do You Need One?
Greg Haley | May 3rd, 2018
One of the big benefits of using a PLC from the Omron NX1P PLC family is the ability to add I/O modules directly to the side of PLC. This allows machine builders to customize the PLC I/O for their specific application and to only pay for the specific I/O they need.
When I/O modules are added to the NX1P PLC, there are 3 different ways the module can be powered:
The I/O module gets power through the NX bus.
Power is supplied to the units via an external power supply.
The I/O module does not use the power or when the unit generates the power internally.
Any module that uses option 1 will require an additional I/O power supply unit. This is commonly overlooked and we constantly see a failure to order the required power module(s). See Table 1 below for a list of the I/O modules that require a PF power module.
When it comes to selecting an NX-PF module, there are a few options to choose from. It is necessary to select the correct module or modules (some application require more than one) based on the amount of power required. Omron has a step by step guide on how to select the module(s) in the manual for the NX1P PLCs. See section 4-3-2 Designing the I/O Power Supply from the NX Bus of the NX102 Manual for the list of instructions.
Greg received his degree in Mechanical Engineering from the University of Florida. He has spent his entire professional career working in the automation industry, including as a consultant building an automated manufacturing system, 4 years as a Field Engineer in the automated test industry, and most recently, a Motion/Robotics solution provider with Cross Company.