Digital Status Outputs; Figure 2-4 Digital Output Connections; Table 2-1 Digital Status Output Pins - Teledyne 460H NEMA Instruction Manual

2.4.2 Digital Status Outputs

The M460H has four digital status outputs for indicating error and operational status
conditions. These outputs are in the form of opto-isolated open-collector transistors.
They can be used to drive status LED's on a display panel or interface to a digital device
such as a Programmable Logic Controller (PLC).
Figure 2-4 shows the most common way of connecting the digital outputs to an external
device such as PLC. Note: Most devices, such as PLC's, have internal provision for
limiting the current that the input will draw from an external device. When connecting to
a unit that does not have this feature, external dropping resistors must be used to limit the
current through the transistor output to 50mA or less.
See Chapter 7 for details on using the Status Outputs for diagnosing sensor and system-
level malfunctions.
Table 2-1 below describes the function of the status outputs.
Label
STATUS OUT 1
STATUS OUT 2
STATUS OUT 3
STATUS OUT 4
STATUS OUT 5
STATUS OUT 6
STATUS COM
Opto-Isolator
P/N 03662D Teledyne API Model 460H O 3 Monitor Operator Manual - Page 15

Table 2-1 Digital Status Output Pins

Name
Sensor O.K.
Invalid Reading
Lamp Low
Cell Dirty
Auto-Zero Error
Spare
Common Pin for
all Status Outputs
M454
Digital Output #1-4 (Collector)
Digital Output Common (Emmiter)

Figure 2-4 Digital Output Connections

Operation
Normally On
Normally Off
Normally Off
Normally Off
Normally Off
Undefined
N/A
Programmable Logic
Controller or other device
+5V
Digital
Input
Ground Provided
by PLC