Asked plainly, what is cmms system means what is the thing, what is it made of, and would it help me. A CMMS system is software that keeps a register of the equipment you maintain, raises the work that equipment needs on a schedule, holds every work order against the asset it was done on, and keeps the history. That is the whole of it. This page defines cmms without the jargon, answers what are cmms systems made of, and says whats cmms for a small team against what it is for a plant with a thousand assets.
The definition
A CMMS system is a database of assets with a scheduler and a work order system attached. The database says what you own and where it is. The scheduler says what each thing needs and when, and raises a work order when the date or the meter comes round. The work order system holds every job, planned or reactive, with its priority, its assignee, its status and what was done. Everything reported from a CMMS, overdue lists, MTBF, cost by asset, is a view of those records.
What it is made of, screen by screen
An asset screen with the equipment tree: site, area, line, machine, component. A schedule screen with the preventive tasks and their intervals. A work order list filtered by due date, priority and assignee. A mobile view for the technician doing the job. A history against each asset. A reporting screen that counts and sums. Vendors add inventory, purchasing, meters and sensors, and the charter of this hub stops at the four core screens because that is what maintaining equipment needs.
Whats cmms for a small team against a large plant
For a small team it replaces the whiteboard and the spreadsheet: the same jobs, but with the overdue list visible and the history kept. For a large plant it is the system of record that planners, technicians, stores and finance all read, and the setup is a project. The software is often the same; the difference is how much of it is used. A small team that buys the large-plant setup spends its first year configuring screens it will not open.
How it differs from the spreadsheet it replaces
A spreadsheet can hold the register and even the schedule. What it cannot do is raise a work order when the interval comes round, let a technician close it from the floor, or keep the history against the asset in a way that survives the person who built the spreadsheet leaving. The maintenance log worksheet on this site is deliberately the spreadsheet version, so a team can see exactly where it stops being enough.
Questions people ask about what is cmms system
Is CMMS software or a process?
Software, but it only works inside a process: somebody has to build the register, write the schedule, and close work orders. A CMMS bought without the process is an expensive address book.
What is the difference between a CMMS and an EAM?
EAM adds the financial life of the asset: purchase, depreciation, disposal, procurement. A CMMS is the maintenance part. Most small and mid-sized operations need the CMMS and not the rest.
Can a CMMS run on a phone?
Every current one can, and the technician's phone is where most of the value is captured: the work order is closed at the machine with what was found, not from memory at the end of the shift.