3 — PROGRAMMABLE PARAMETERS
Curtis Model 1351 – December 2018
pg. 42
Virtual Switches
The 1351 System Controller can process each of the analog input channels as a digital input switch
by comparing the incoming voltage to corresponding high and low threshold parameters—resulting
in a “virtual” Off or On switch. The resulting virtual switch (VSW) status is available to VCL.
• Virtual switches 1 – 4 share the encoder inputs.
• Virtual switches 5 – 8 are common to the RTD inputs.
• Virtual switches 9 & 10 are the pot high and wiper inputs.
• Virtual switch 11 shares the analog input at pin 22.
See the corresponding Analog Input Low and High Thresholds parameters, which set the high and
low thresholds for the virtual switch inputs.
INPUTS — VIRTUAL SWITCHES
PARAMETER
ALLOWABLE RANGE
DEFAULT
DESCRIPTION
VSW 1 through 4: X = Virtual Switch Number which is part of the VCL parameters’ name
Status
Virtual_Switch_X
Variable’s CAN Index by Switch No.
1 = 0x3380 0x00
2 = 0x3381 0x00
3 = 0x3382 0x00
4 = 0x3383 0x00
0 – 1
0 – 1
Read Only
Virtual Switch 1 status: On = 1 or Off = 0 (pin 1)
The status is also available in the corresponding programmer’s
analog inputs menu and the monitor menu:
Configuration » Inputs » Analog Inputs » Analog X:VSW Status
Monitor » Inputs » Switch Input » Virtual Switch X
X = 1, 2, 3, or 4 for Virtual Switches 1 – 4.
Active level
Virtual_Switch_X_Active_Level
Parameter’s CAN Index by Switch
No.
1 = 0x31D0 0x00
2 = 0x31D1 0x00
3 = 0x31D2 0x00
4 = 0x31D3 0x00
Low – High
0 – 1
High
1
When an analog input is used as virtual switch, set the active
level to Low or High (here). Then set the corresponding Analog
Input Low and High Thresholds parameters to match. See:
Programmer » Configuration » Inputs » Analog Inputs » Analog X
:
High Threshold
Low Threshold.
VSW 5 through 8: X = Virtual Switch Number which is part of the VCL parameters’ name
Status
Virtual_Switch_X
Variable’s CAN Index by Switch No.
5 = 0x3384 0x00
6 = 0x3385 0x00
7 = 0x3386 0x00
8 = 0x3387 0x00
0 – 1
0 – 1
Read Only
Virtual Switch X status: On = 1 or Off = 0
X = 5, 6, 7, or 8 for Virtual Switches 5 – 8
The status is also available in the corresponding programmer’s
analog inputs menu and the monitor menu:
Configuration » Inputs » Analog Inputs » Analog X:VSW Status
Monitor » Inputs » Switch Input »
Virtual Switch X
Note: The pin can also be used as the AnalogX / RTDX input
(
). Chose one type of usage, only.
Open State
RTD_X_Enable
Parameter’s CAN Index by Switch
No.
5 = 0x3050 0x00
6 = 0x3051 0x00
7 = 0x3052 0x00
8 = 0x3053 0x00
Float – Pull Up
0 – 1
Float
0
Float = analog input as a virtual switch
Pull Up = RTD Enabled
X = 5, 6, 7, or 8 for Virtual Switches 5 – 8
Note that changing this parameter will change to the
corresponding
RTD X
Enable parameter and vice versa. See:
Configuration\Inputs\RTD Input\RTDX\RTD Enable
