3 — PROGRAMMABLE PARAMETERS
pg. 65
Curtis Model 1351 – December 2018
Digital Drivers
The three digital drivers are low-side drivers, each with a 3-ampere current (sink) limit. These outputs
can only be commanded by the VCL constants ON or OFF. (or 1 and 0). The control modes for
PWM, constant current or voltage are not available. For inductive loads, these digital drivers have
an internal fly-back diode to Coil Return. Resistive and capacitive (RC) loads must not exceed the
3-amp current-sink rating. These three drivers use the same VCL function as used for the Safety
Output (refer to that section, below).
These drivers can be commanded by the constants ON or OFF. (or 1 and 0) using the
Digital Out_X_
Commmand
or the VCL function
Put_Digital_Out()
. For example,
Digital_Out_2_Command = ON
;fully turns-on the driver Digital Out 2 (pin 25).
The switch inputs related to these digital drivers, with their pull-up/downs are completely separate
and can perform independently from the digital output. The switch operation is not related to the
Enable or Off state of the driver. In fact, the driver and the switch can be used at the same time....
BUT do not switch to B
+
if the digital driver is ON.
OUTPUTS — DIGITAL OUTPUTS
PARAMETER
ALLOWABLE RANGE
DEFAULT
DESCRIPTION
Digital Out X State
Digital_Output_X_State
Variable’s CAN Index for
Digital_Output_X_State
1 = 0x3403 0x00
2 = 0x3404 0x00
3 = 0x3405 0x00
OFF – ON
0 – 1
Read Only
Present state of the digital output. When it is the driver and is
commanded on, the pin will be pulled to B-/ground and the state
will read ON (1).
X= 1, 2, or 3 for this monitor variable (Digital Out X State) and the
corresponding VCL name:
Digital_Output_X_State
This monitor variable is also available in the Monitor menu:
Monitor\Outputs\Digital Drivers\Digital X State
Digital Out 1 Mode
Digital_Out_1_Mode
0x30EC 0x00
Off – Enabled
0 – 1
0
0
Enables the Driver to be used as an output, otherwise this is the
Analog 1 input or Encoder 2B input (See the example wiring diagram).
When enabled, the digital driver will turn on and off according
to the
Digital Output X Command
variable or
Put_
Driver()
VCL functions.
0 = Digital Out disabled
1 = Digital Out can be controlled
Digital Out 2 Mode
Digital_Out_2_Mode
0x30ED 0x00
Off – Enabled
0 – 1
0
0
Enables the Driver to be use as an output, otherwise this is the
Switch 11 input (See the example wiring diagram).
0 = Digital Out disabled
1 = Digital Out can be controlled
Digital Out 3 Mode
Digital_Out_3_Mode
0x30EE 0x00
Off – Enabled
0 – 1
0
0
Enables the Driver to be use as an output, otherwise this is the
Switch 12 input (See the example wiring diagram).
0 = Digital Out disabled
1 = Digital Out can be controlled
Test
Digital Out 1 Command
Digital_Out_1_Command
0x3409 0x00
0 – 1
0 – 1
0
0
Sets the driver action.
0 = Off
1 = On (driver must be enabled to actually be affected by the
command)
Digital Out 2 Command
Digital_Out_2_Command
0x340A 0x00
0 – 1
0 – 1
0
0
Sets the driver action.
0 = Off (see the corresponding Mode parameter, above)
1 = On (See the corresponding Mode parameter, above)
Digital Out 3 Command
Digital_Out_3_Command
0x340B 0x00
0 – 1
0 – 1
0
0
Sets the driver action.
0 = Off (see the corresponding Mode parameter, above)
1 = On (See the corresponding Mode parameter, above)