Security Role

what are the roles & responsibilities of a security guard and security officer?
Our company is a leading manufacturing industry of PVC pipes,HDPE pipes,drip & sprinkler pipes in Maharashtra .we are having about 500 employees in our organization. We have also sales depots in 8 other sates. We want to know the detailed roles of security guard.

1.security guard communicate to place of work and material or man movement watch
2.security guard control for material movement and unwanted person movement watch