Watlow D4T Data Logger
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Chapter 5 Function Reference
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Direction
To configure the I/O point to detect a voltage level as a digital input, set Direction to
Input
Voltage.
Digital Outputs
Use a digital output block to drive an external device. Output blocks can accept either a digi-
tal (on/off) signal or an analog percentage signal. The following FBs are discussed in this sec-
tion:
SSR and Switched DC/Open Collector
drive outputs on flex modules that are appropriate for
loads that can be switched frequently.
Electromechanical and NO-ARC Relays
drive outputs on flex modules that are appropriate for
loads that need not be switched frequently.
Solid-State Relay - Switched DC/Open Collector
These blocks are found on the canvas in the Function Block Diagram editor. The number of
these blocks available depends on the number of solid state relays, switched DC outputs and
open collector outputs on the flex modules installed in the data logger.
Signals
Direction
Label
Type
Function
Receiver
- - - - Analog %
or Digital
Off or 0%: the output is off.
Between 0% and 100%: the output switches according to
the Time Base Type setting.
On or 100%: the output is on.
Name
Uniquely identify this FB using up to 20 alphanumeric characters.
Time Base Type
Choose the method used to operate the output when the input is an analog percentage. With
either of the methods the output switches off and on such that the average amount of time
the output is on equals the desired percentage.
Note:
The type of field device connected to the output determines how frequently it can be
switched.