Watlow F4T User Manual

Watlow F4T • 131 • Chapter 5 Function Reference
Input Dry Contact
This FB is found on the canvas of the FB diagram. The number of these FBs that are available
depends on the number of flex modules with a digital input configured as a dry contact.
Signals
Direction Label Type Function
Transmitter - - - - Digital
Transmitter is inactive (off) when measured resistance is
greater than 100KΩ and active (on) when less than 50Ω
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Input Type
To configure the input to detect a contact closure, set Input Type to Input Dry Contact.
Input Voltage
This FB is found on the canvas of the FB diagram. The number of these FBs that are available
depends on the number of flex modules with a digital input configured to receive voltage.
Signals
Direction Label Type Function
Transmitter - - - - Digital
Transmitter is inactive (off) when measured voltage is less
than 2V and active (on) when greater than 3V
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Input Type
To configure the input to detect a voltage level as a digital input, set Input Type to Input Volt-
age.
Digital Inputs/Outputs (I/O)
Use a digital input/output block to connect a field I/O device’s signal to the application. This
FB can be configured as either a digital input that can be triggered by an external device or a
digital output that can switch an external device. As an output, the block can accept either a
digital (on/off) signal or an analog percentage signal.
The block is configured as an input or output with the Direction parameter. These options for
the Direction parameter setting are described in detail in the following sections:
Input Dry Contact: the block’s output is on when a switch closure is detected by the corre-
sponding input on the flex module.
Output: the block drives the corresponding output on the flex module according to the signal
connected to the block’s input.
Input Voltage: the block’s output is on when a sufficient voltage is detected by the corre-
sponding input on the flex module.

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