Curtis 1234/36/38 Manual, Rev. D
87
1 1 J U LY 2 0 0 8 D R A F T
VCL RUNTIME RATES
VCL is an interpreted language. Each line of VCL code is converted (compiled)
into a set of codes and then flash loaded into the controller. The controller
interprets these codes one line at a time while the system is powered up. Here
are the processing rates of the various functions:
FUNCTION FUNCTION FULL NAME INSTANCES SERVICE RATE
ABS Absolute Value 2 4 ms
ADC Analog to Digital Converter Input 2 1 ms
CAN CAN Communications 15 4 ms
CPY Copy 8 4 ms
DLY Delay 32 1 ms
FLT Filter 4 1 ms
LIM Limit 4 4 ms
MAP Map 4 4 ms
MTD Multiply then Divide 4 4 ms
NVM Non-Volatile Memory 38 2 ms
PID Proportional Integral Derivative 2 4 ms
POT Potentiometer Input 2 8 ms
PWM Pulse Width Modulated Output 6 4 ms
RMP Ramp 4 1 ms
SCL Scaling 4 4 ms
SEL Selector, 2-position switch 8 4 ms
SEL_4P Selector, 4-position switch 8 32 ms
SW Switch Input 1
* 4 ms
TMR Timers (hourmeters) 3 1 ms
* There is only one Switch variable; it has 16 associated bit-variables.
I/O CONTROL WITH VCL
Digital Inputs
The 1234 controller has at total of 16 digital inputs, and the 1236/38 has 15.
Eight are switch inputs (Sw_1 through Sw_8) on all the models; the 1234 has
a ninth switch input, Sw_16. These switch inputs are shown on the standard
wiring diagram (Figure 3, page 12). The remaining seven digital inputs are less
obvious: one on each driver and digital output (Sw_9 through Sw_15). These
can be used as digital inputs or to sense the state of the output or its wiring
(e.g., open coil check).
To address a digital input in a VCL program, use the desired input label
(Sw_1 through Sw_16). You must use On or Off in the code when determining
a switch state; using true/false or 1/0 will give erroneous results.
7 — VCL
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