BTEK T419S, Service Manual

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124 T419S Indicator Service Manual
13.6 B-TEK Remote Inputs and Outputs, Opto-22 Module Application
Notes
This section contains general information about varying topics that can assist or educate users who are new to B-TEK systems.
13.6.1 I/O interfaces
I/O interfacing to the indicator must be tested before the indicator is sealed. Before you attempt to connect external devices to the indicator,
you must fully understand what these interfaces are expected to do, as follows:
• Is it possible?
• Are they electrically compatible with our I/O, voltage, current, and so on?
• Are there any drawings available?
• Details of internal connections on B-TEK equipment.
Consult an electrician during the connection and testing process.
13.6.2 Inputs
Here are the things you need to do:
l
Identified the terminal numbers in the indicator (for example: TB1, TB2, etc.)
l
Determine if the inputs are mechanical or digital logic inputs. See note below.
Mechanical (remote switch) inputs receive their voltage from the identified indicator
terminal.
Digital logic inputs change state based on a secondary or remote interface (such as a
PLC or HMI, human-machine interface).
VDC
Mechanical
Input
Indicator
GND
V
bus
V
bus
VDC
GND
Digital
Input
+5VDC to 0 Logic Signal
Low signal activated
Common ground between devices
PLC/HMI device digital I/O
Switch
Indicator
Figure 13.1 Typical input wiring