User manual

Computer Gateway User Manual 2-4 5/96
2.2.1
2.2.1.1 Scheduled Program Activation
Periodic programs first run at a specified daily start time (STIME) and thereafter run at a
specified time interval (RTPERIOD).
Example 1: RTPERIOD = 24:00:00 STIME = 17:00:00
This periodic program will run each day at 17:00:00 hours.
Example 2: RTPERIOD = 08:00:00 STIME = 07:00:00
This periodic program will run each day at the following hours: 07:00:00, 15:00:00
and 23:00:00.
Cyclic programs in Normal state first run on host processor start or restart (if their ACIDPs
are built with RUN INIT = ON) and thereafter run at a specified time interval
(RTPERIOD).
Example 3: RTPERIOD = 00:10:00
Once initiated, this cyclic program will run every 10 minutes.
Scheduled operation of an ACP is not requested by the CG while the associated ACIDP
shows it in either Test or Restricted operating state. It must be installed and in Normal
state.
The time-interval range for both periodic and cyclic programs is 10 seconds to 24 hours
(the CG scheduler function runs at 10-second intervals). The subcategories of periodic/
demand and cyclic/demand programs also allow for activation by process-operator demand
from the Universal Station.
2.2.1.2 Program Activation by Operator Demand
An ACP can be activated from a Universal Station through the Operator Demand target on
its ACIDP parameter display, if its activation type is either demand, cyclic/demand, or
periodic/demand. You can also create custom displays that provide for operator-demand
activation of ACPs. See the Picture Editor Reference Manual for details.
2.2.1.3 Program Activation by Process Special Event
The associated ACP is immediately activated following a store data of ON to an ACIDP's
PPS parameter from another ACP, an HG (Event Initiated Processing), or an AM (CL
"Set" statement). This activation method is also used by the CG upon receipt of a Message
to an ACP. PPS activation is independent of the configured scheduling method.
2.2.1.4 Inhibit of Program Activation
The process operator can prevent/permit an ACP's activation by the CG from the associated
ACIDP's Detail Display at the Universal Station. Optionally, you can construct a custom
display that performs this function by a store of INHIBIT/PERMIT to the ACDIP
INH_STAT parameter.