MKS 651C - Analog Set Point Inputs; Table 18: Digital Output Functions

Chapter Six: Remote Operation Di
g
ital Lo
g
ic Control
95
Digital Output Functions
Digital
Output No.
I/O Pin No. State Digital Output Function
129Low
High
Pressure outside of PLO 1 band (relay is
not
energized)
Pressure inside of PLO 1 band (relay
is
energized)
228Low
High
Pressure outside of PLO 2 band (relay is
not
energized)
Pressure inside of PLO 2 band (relay
is
energized)
323Low
High
Valve is not closed
Valve is closed
419Low
High
Valve is not open
Valve is open
518Low
High
No function
No function
617Low
High
No function
No function
Table 18: Digital Output Functions
Analog Set Point Inputs
The analog set point inputs, +set point (I/O pin 33) and -set point (I/O pin 34) on the I/O
connector, are fully differential. The -set point must be connected to a ground to work correctly,
and it is recommended that it be connected to ground at the source of the set point signal.
To achieve softstart control of analog (or digital logic) set points, the
softstart line (I/O pin 7)
must be held low
. If the line is
not
held low, the valve will move at 100% full speed.
If an analog set point is established via RS-232 input, the softstart rate for the analog set point is
selected through use of the
I6
value
RS-232 command.