3. Latch — Limit lights and logic latch the most positive and excursion of the analog input.
Latches are Follow cleared by returning to reset or follow modes.
4. Hold — Limit lights and logic are locked into their present status and ignore any signal
input. This condition is cleared by returning to reset or follow mode.
To activate any of these special modes, turn the function switch to the auto run position. Determine
the desired function and, using the truth table, apply a 5-24 VDC command to the I/O pins as listed.
These voltages must be positive with respect to user common P24.
0 = Off State
1 = On State
Truth Table Rear Panel I/O
P15 Write Disable
P16 Reset
Function
Off
0
Off
0
Follow (Default)
Off
0
On
1
Latch
On
1
On
1
Hold
On
1
Off
0
Reset
Outputs
Three optically isolated outputs, representing over, good, under, and approach are encoded and
available to the user through the 25 pin I/O connectors (See Table). The outputs are open collector
NPN OPTO transistors whose emitters are referenced to user common P24 of the I/O connector.
The transistor may be pulled to a maximum of 24 VDC.
Output Codes Rear Panel I/O
Condition
P12 Over
P13 Good
P14 Under
Under
Off
0
Off
0
On
1
Under Approach
Off
0
On
1
On
1
Good
Off
0
On
1
Off
0
Over Approach
On
1
On
1
Off
0
Over
On
1
Off
0
Off
0
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