Plc Interface; Pin Allocations - JEM Glaciator X-stream User Manual

PLC
INTERFACE
The PLC interface connector is operational without the need to fit an extra
interface PCB to the machine. This allows installers to control the
functions of the machine using active low signals from a PLC or other
automatic control system. The fog and density levels must be preset on
the display units, or alternatively, a 0-10V signal can be used at the
remote interface connector (XLR3).
Since the interface has no opto-isolators, the external control system
should use voltage free contacts or opto-isolated outputs to control the
machine. The signals are active low, and need a threshold voltage of 1.5V
or less at 2mA to activate the functions.
The internal circuits of the interface offer very little overload or
interference protection, meaning that any control device should be
located physically close to the machine. This will prevent problems due to
long cable runs etc.
The special function pin 5 of the interface connector (9 way D-type) is now
allocated to allow the machine to be shut down by a remote fluid sensing
system. The input is active low and has the same electrical specification
as the other inputs.
To allow the external fluid system to use a remote pump, a 'normally open'
contact is connected to pins 8 and 9.
P I N A L L O C A T I O N S
1
2
3
4
5
6
7
8
9
Fog
Standby
Timer
Fan
Shutdown (low fluid)
Ground
N/C
Remote pump run A
Remote pump run B

PLC interface

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