Installation manual
CNC 8035
PLC PROGRAMMING
Consulting instructions
8.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·303·
8.3 Consulting instructions
They may be used to check the status of PLC resources as well as the marks and registers for CNC-
PLC communication. They are divided into:
• Simple consulting Instructions.
• Flank detection consulting Instructions.
• Comparison consulting Instructions.
All the consulting instructions allow the previous operand NOT, which reverses the result of the
preceding consultation.
Example:
NOT I1 This Consultation will return a "0" if input I1 is at 1; and a "1" when input I1 is at 0.
Simple
They test the status of the resources and they return their logic state.
Example:
I12 It will return a 1 if input 12 is active and a 0 if otherwise.
Flank detection
They check whether the state of a resource has changed since the last time this consultation was
made.
This consultation may be made on real or image values. There are two types of instructions:
DFU
It detects an up-flank (0-to-1 change) at the indicated resource. It returns a "1" if it happened.
DFD
It detects an down-flank (0-to-1 change) at the indicated resource. It returns a "1" if it happened.
The programming format of the different combinations is:
The consulting instructions to detect the flanks of marks M4000 thru M4127, M4500 thru M4563,
M4700 thru M4955 and M5000 thru M5957 will be executed with their real values even when working
with image values since these marks have no image values.
Considering that these instructions can evaluate real and image values, the following points must
be taken into account:
I 1/512 Inputs
O 1/512 Outputs
M 1/5957 Marks
T 1/256 Timers
C 1/256 Counters
B 0/31 R 1/499 Register Bits
DFU (Up flank detection.) I 1/512
DFD (Down flank detection) O 1/512
M 1/5957
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