Watlow F4T User Manual

Watlow F4T • 175 • Chapter 5 Function Reference
Name
Set the name to display for event 7 in the controller user interface and in the profile editor.
Options:
• Any alphanumeric character (20 maximum)
Event 8
Indicates the state of event 8 and allows the output to be forced when the profile engine is
not running a profile.
Options:
• Off: the event is off
• On: the event is on
Name
Set the name to display for event 8 in the controller user interface and in the profile editor.
Options:
• Any alphanumeric character (20 maximum)
Process Value
Use this block to produce a conditioned analog signal based on up to four analog signals and
one digital signal. A filter and offset may be applied to the function’s output. This block is
found in the Function Block Diagram editor’s Library. Within the Library, the number of these
blocks available is shown in parenthesis and that number is determined by the controller part
number. The type of conditioning performed by the process block depends on the setting of
the Function parameter. These options for the Function parameter are described in detail in
the following sections:
Off: the output follows the filtered input plus the offset.
Sensor Backup: automatically switches to the next of up to three alternate inputs when a sen-
sor fails.
Average: calculates the average of up to four inputs.
Crossover: gradually transitions from one input to another over a user-defined range.
Wet Bulb / Dry Bulb: calculates relative humidity based on two temperature measurements.
Switch Over: selects one of two analog inputs with a digital input.
Differential: subtracts one input from another.
Ratio: divides one input by another.
Add: sums up to four inputs.
Multiply: computes the product of up to four inputs.
Absolute Difference: calculates the absolute value of one input subtracted from another.
Minimum: outputs the lowest of up to four inputs.
Maximum: outputs the greatest of up to four inputs.
Square Root: calculates square root of an input.
Vaisala
®
RH Compensation: calculates the relative humidity based on the input from an un-
compensated relative humidity sensor and a temperature measurement.
Pressure to Altitude: calculates the standard distance above sea level based on an atmospher-
ic pressure.

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4