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4-114 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
4
SER
The SER function (Sequential Event Recorder) function is used to collect data based on an event
trigger. A function control block contains user-supplied information about function block execution,
channel descriptions and operation parameters.
The function has a function control block, three input parameters and one output parameter, defined
as follows:
Parameters:
Parameter Description
enable Whenever the function is enabled and the reset input is off, the SER function block will
collect one sample from all configured channels.
Control Block The 78-word array begins at the Word reference you specify here, and is used to define
how the SER function will record data.
R When the reset input receives power flow, the SER function will be reset regardless of
the state of the enable input. The function block will remain in the reset state until power
flow is removed from the reset input. The OK output will be turned off while in the reset
state. When the power flow is removed from the reset input, channel sampling will
resume.
T When the trigger input receives power flow and the reset input is off, the SER moves to
the triggered state and records the Trigger Time, Trigger Sample Offset and a sample.
The trigger input requires power flow to the enable input so that a data sample may be
collected from all configured channels on a trigger condition.
The trigger sample will be recorded regardless of the number of samples taken. Once
triggered, the event recorder will continue sampling until the Number of Samples After
Trigger is satisfied. At which time it will stop collecting samples until power flow is
seen on the reset input
ok The ok output is energized whenever the trigger conditions are satisfied (specified by the
Trigger Mode parameter), and all sampling is complete. The output will continue to
receive power flow regardless of the state of the enable input until the reset receives
power flow.
Note
This function requires version 9.00 or higher CPU firmware, and is available only
on 350 and higher CPUs.
Valid Memory Types:
Parameter flow %I %Q %M %T %S %G %R %AI %AQ const none
enable •
Control Block •
R •
T •
ok • •
• Valid reference or place where power may flow through the function.