Remote Interface — Two user control lines present on the I/O connectors located on the rear
panel of the Trendsetter™ mainframe, allow an external controller to command four special
operating modes. These modes are as follows:
1. Reset — All latches cleared, limit lights and logic outputs off.
2. Follow — Same as manual run, limit lights and logic outputs follow the
signal input.
3. Latch and follow — Limit lights and logic outputs follow signal input and
latch any over or under excursions. Latches are cleared by returning to either reset
or follow mode.
4. Hold — Limit lights and logic outputs are locked into their present status,
and ignore all signal input. This condition is cleared by returning to reset or follow
mode.
To activate these special modes, turn the function switch to Auto Run position.
Determine the desired function and, using the truth tables, apply a 5-24 VDC command to the I/O
pins listed. These signals 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 and Follow
On
1
On
1
Hold
On
1
Off
0
Reset
Outputs
Three optically isolated outputs, representing over, good, and under, are available to the user
through the rear panel I/O connectors. The outputs are open collector NPN OPTO transistors,
whose emitters are referenced to user common P24.
The transistors may be pulled to a maximum of 24 VDC. Their main function is to interface to the
E8204 relay interface cabinet.
OUTPUT CODES REAR PANEL I/O
Condition
P12 Over
P13 Good
P14 Under
Under
Off
0
Off
0
On
1
Good
Off
0
On
1
Off
0
Over
On
1
Off
0
Off
0
15
