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Programming and Operating Concepts
Function block
name
Alarm
Analog Input
Analog Output
Calculated Value
Constant
Discrete Input
Discrete Output
Loop
Setpoint Profiler
System
Totalizer
* Depends on options ordered.
Why use function blocks?
Function blocks give you configuration flexibility. For instance, the instrument does not have a dedicated
relay that is activated during an alarm; instead, you can program any of several Alarm function blocks to
control any relay. Also, there is not a specific input for your process variable; any of several Analog Input
function blocks can be programmed to be your process variable. In general, function blocks let you
connect the output parameter of any function block to the input parameter of any function block.
50
Table 3-3 Function Block Types
Type
Maximum
available*
AL
96
Causes alarms under specified conditions.
AI
48
Interfaces with measuring input hardware (thermocouple,
RTD, mA, volts).
AO
8
Interfaces with analog output hardware (current output
(CAT)) or with output relay hardware (time proportion
(DAT)).
CV
96
Performs various calculations on specified parameters.
CN
32
Outputs a number or an analog parameter value.
DI
36
Interfaces with discrete input hardware (dry contact
closure).
DO
36
Interfaces with output relay hardware (AC relay, DC
relay, mechanical relay, open collector output).
LP
8
PID or ON/OFF control with various outputs.
SP
4
Generates a time-varying setpoint for a loop's Setpoint
#2.
SY
1
Outputs discrete status of alarms, data storage, and
diagnostics; outputs analog value of reference junction
temperature. This function block is not programmable; its
outputs are produced automatically.
TL
48
Outputs accumulated total over time.
Video Recorder – User Manual
Purpose
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