Honeywell HC900 - Page 29

Design and Implementation of HC900 Control System - Allowable Function Blocks for Process and Safety Functions
Revision 1.9 HC900 Process & Safety Controller Safety Manual 21
01/14
Event Decoder
Sets up to sixteen digital event outputs that may be
ON or OFF on a per segment basis. If Program
Number (PGM) = 0, Segment Number (SEG) = 0, or
Program State (STA) is RESET; then: E1 to E16 =
OFF. Otherwise, E1 to E16 = as specified in program
(PGM), segment (SEG).
X
Synchronizer
Synchronizes changes in setpoint Program State for
multiple SPP function blocks when the state of any
connected SPP is changed from the operator panel or
communication request.
X
Setpoint
Scheduler Blocks
Setpoint
Scheduler
Synchronizes changes in setpoint Program State for
multiple SPP function blocks when the state of any
connected SPP is changed from the operator panel or
communication request.
X
State Switch
Connects to Master block (SPS) via dedicated
connection and accepts digital inputs to cause
scheduler mode changes. The State Switch block
accepts state request digital inputs and produces an
encoded output for input to the master (SPS) block.
X
State Flags
Connects to Master block (SPS) via dedicated
connection and provides logic 1(ON) state digital
outputs for Scheduler modes. The State Flags block
accepts the encoded master block state as input and
produces digital outputs corresponding to the current
value of STFL.
X
Setpoint
Scheduler
Auxiliary
The eight setpoint outputs of the Auxiliary Setpoint
block are set to the current step value. The current
step is an input to the block and must be connected
to the step output of a Master Scheduler block. At the
end of a step, the outputs of the slave block go
directly to the next step value. That is, Ramps are not
supported.
X
Event Decoder
Sets up to sixteen digital event outputs that may be
ON or OFF on a per segment basis. If Program
Number (PGM) = 0, Segment Number (SEG) = 0, or
Program State (STA) is RESET; then: E1 to E16 =
OFF. Otherwise, E1 to E16 = as specified in program
(PGM), segment (SEG).
X
Logic Blocks
2 Input AND
Turns digital output (OUT) ON when inputs X1 and
X2 are ON.
X
X
4 Input AND
Turns digital output (OUT) ON when inputs X1
through X4 are ON.
X
X
8 Input AND
Turns digital output (OUT) ON when inputs X1
through X8 are ON.
X
X