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GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-115
4
The Sequential Event Recorder function block is a 78-word array defining information about the
data capture and trigger mechanism for the SER function. Perform these steps to configure
parameters for the SER function block.
1. Set up the stored values for the array as defined in the table below. You can use block moves
to initialize the registers, or initialize the data in the register table and store the table prior to
activating the SER function.
2. Add the SER function to your ladder.
Parameter(Offset) Description
Status(0) Read only variable which indicates the current state of the SER function
block. Additional information is provided in Status Extra Data, Offset 1 in
the SER control block. NOTE: If an error is detected in the Control Block,
The status will be set to 6, the OK output will be cleared and no action will
occur. Valid settings for Status include:
0 = Reset
1 = Inactive
2 = Active
3 = Triggered
4 = Complete
5 = Overrun Error
6 = Parameter error
Status Extra Data(1) A read-only variable that provides additional state information about the
SER function. Click on “Status Extra Data” valid settings for this
parameter.
Trigger Mode(2) Defines the enabling action for the trigger condition: To select the Trigger
boolean input as the enabling condition, set this parameter to 0. To select
Full buffer as the enabling condition, set this parameter to 1.
If the trigger condition is enabled by power flow to the Trigger boolean
input, the OK boolean output will not pass power flow until the Number of
Samples After Trigger has been satisfied.
If the trigger condition is enabled by a Full buffer, the OK boolean output
will pass power flow when the user's buffer is full. The buffer size is set
through the Number of Samples parameter.
Trigger Time
Format(3)
Determines how the Trigger Time will be displayed. For BCD (Binary
Coded Decimal) display, set this parameter to 0. For POSIX format
display, set this parameter to 1.
Reserved (4—7) Words 4 through 7 are reserved and should be set to zero(0)
Num of Channels(8) Specifies the number of bits of data that will be sampled and returned to the
sample buffer for each execution of the function block. Valid choices are 8,
16, 24 or 32 bits. The increment is in byte size (8 bits) and any unused
channels must be configured with a null channel description.