gtpm6m0cMain Supervisor Reference

State Change

The state change process is known as cycle-up when system resources and functions are being activated and cycle-down when system resources and functions are being deactivated. During cycle-up, additional resources and functions are made available in successively higher system states, until all resources are available. There are 5 system states cycled up in the following ascending order:

You can change system states with the ZCYCL command and display the system state with the ZDSYS command. See TPF Operations for detailed information on the functions available in each state.

Note:
Application programmers should consider the services and functions that are operational during a particular system state when designing application programs.

1052 State

1052 state is the lowest system state. Most system services are inactive. Services active during 1052 state include:

Utility State

Utility state can be entered only from 1052 state. Thus, the system must be returned to 1052 state from any other state (CRAS, message switching, or norm) before utility state can be entered. Utility state services include:

CRAS State

In CRAS state, all of the services active during utility state are active, as well as the following services:

Message Switching State

Message switching state is similar to CRAS state, with the following exceptions:

Norm State

Norm or normal state allows the activation of all system and application services and functions. All entries are allowed in norm state.