Delay task processing for a specified timeframe.
Post an ECB at the end of a specified timeframe.
Initiate a task at the end of a specified timeframe.

►►─── SET TIMER ─┬─ WAIT────┬─────────────────────────────────────────────────►
                 ├─ POST ───┤
                 ├─ START ──┤
                 └─ CANCEL ─┘

 ►─┬──────────────────────────────────┬───────────────────────────────────────►
   └─ INTERVAL 
time-interval seconds ─┘

 ►─┬──────────────────┬───────────────────────────────────────────────────────►
   └─ EVENT 
post-ecb ─┘

 ►─┬───────────────────────────────────────────────┬──────────────────────────►
   └─ TASK CODE 
task-code ─┬─────────────────────┬─┘
                           └─ PRIORITY 
priority ─┘

 ►─┬────────────────────────┬─────────────────────────────────────────────────►
   └─ TIMER ID 
ice-address ─┘

 ►─┬────────────────────────────────────────────────────────────────┬─ . ─────►◄
   └─ DATA FROM 
task-data-location ─┬─ TO 
end-task-data-location ─┬─┘
                                    └─ LENGTH 
task-data-length ───┘

WAIT
Places the issuing task in a wait state and redispatches the issuing task after the specified time interval elapses. Because WAIT relinquishes control until the time interval has elapsed, a subsequent SET TIMER request cannot be used to cancel this WAIT request.
POST
Posts a user-specified ECB after the specified time interval elapses. The issuing task continues to run. If POST is specified, the EVENT parameter must also be specified.
START
Initiates a user-specified task after the specified time interval elapses. If START is specified, the TASK CODE parameter must also be specified.
CANCEL
Cancels the effect of a previous SET TIMER request.
INTERVAL
time-interval
 
seconds
Specifies the time, in seconds, from the issuance of a SET TIMER request at which the requested event occurs. Specify the symbolic name of a user-defined field that contains the time interval, or the interval itself expressed as a numeric constant. This option applies only to WAIT, POST, and START requests.
EVENT 
post-ecb
Specifies the ECB to post. Specify the symbolic name of a user-defined area that contains three PIC S9(8) COMP SYNC (fullword) fields. This option applies only to POST requests.
The POST instruction only posts an ECB that is within storage owned by the TASK initiating the POST instruction. If the same task does not own the storage, it is not executed.
TASK CODE 
task-code
Specifies the task to initiate. Specify the symbolic name of the user-defined field that contains the task code, or the task code itself enclosed in quotation marks. The task code must have been defined during system generation or at runtime with a DCMT VARY DYNAMIC TASK command.This option applies only to START requests.
PRIORITY 
priority
Specifies a dispatching priority for the task. Specify the symbolic name of a user-defined field that contains the priority, or the priority itself expressed as a numeric constant in the range 0 through 240. The priority for the new task defaults to the priority that is defined for that task code.
TIMER ID 
ice-address
Specifies the address of the interval control element (ICE) that is associated with the timed event. Specify the symbolic name of a user-defined PIC S9(8) COMP SYNC (fullword) field. If POST or START has been specified, 
ice-address
 references a field to which the ICE address is returned. If CANCEL has been specified, 
ice-address
 references the field containing the ICE address that was returned following a SET TIMER POST or SET TIMER START request. This option applies only to POST, START, and CANCEL requests.
If the program is to issue subsequent SET TIMER CANCEL requests, specify TIMER ID with SET TIMER POST and SET TIMER START requests.
DATA FROM 
task-data-location
Specifies the user data to pass to the new task.  Specify the symbolic name of a user-defined field that identifies the beginning of an area containing the data items to pass. This option applies only to START requests.
TO 
end-task-data-location
Specifies the end of the data area being passed to the new task. Specify the symbolic name of a user-defined dummy byte field or a field containing a data item that is not associated with the data area being passed.
LENGTH 
task-data-length
Specifies the length of the data area in bytes. Specify the symbolic name of a user-defined WORKING-STORAGE SECTION or LINKAGE SECTION field that contains the length of the data area, or the length itself expressed as a numeric constant.
The data that is passed to the new task consists of two bytes containing the length of the original data followed by the original data itself. This data can be accessed by a LINKAGE SECTION entry corresponding to the data and a USING clause in the PROCEDURE DIVISION header.

Example 1

The following statement places the issuing task in a wait state and redispatches it after 9 seconds have elapsed:

SET TIMER WAIT
  INTERVAL 9 SECONDS.

Example 2

The following statement posts the event PODB after 5 seconds have elapsed:

SET TIMER POST
  INTERVAL 5 SECONDS
  EVENT PODB
  TIMER ID TMR-ID.

Example 3

The following statement starts the SPSG task after 5 seconds have elapsed and passes the specified data to that task:

SET TIMER START
  INTERVAL 5 SECONDS
  TASK CODE 'SPSG'
  TIMER ID TMR-ID
  DATA FROM PASSGR LENGTH REC-LENGTH.

Example 4

The following statement cancels the timed event that TMR-ID references:

SET TIMER CANCEL
  TIMER ID TMR-ID.