GFK-1504K
Chapter 13 Mixed Discrete/High-speed Counter Module
13-17
13
IC200MDD841
Mixed Module, 24VDC Positive Logic Input 20 Points / Output 12 Point /
(4) High Speed Counter, PWM, or Pulse Train Configurable Points
Pulse Train Outputs
Pulse Train outputs can be used to control stepper motors. Use of an output for this
function is set up as part of the module configuration. When configured as Pulse Train
outputs, the pulse frequency is specified in the module’s output data, as described later in
this section. (See “Module Data”). The range is 1Hz to 5kHz. The module’s output data is
also used to set the number of pulses to be emitted.
The Pulse Train starts when its Output Enable bit is ON and its Pulse Train Start bit
transitions from Off to ON. When the Pulse Train starts, its Pulse Train Complete status
bit is set OFF. When the Pulse Train is complete, the module sets a status bit that can be
read by the CPU or computer.
Note:
Once a Pulse Train is started, it continues until it has completed or until its Output
Enable (%Q) bit goes to 0.
Optical Isolator Correction Factor
The performance of the optical isolators used in the module varies as the temperature
changes. This affects the accuracy of the duty cycle for both PWM and Pulse Train
outputs. To compensate for this, the module incorporates a user configurable Optical
Isolator Correction Factor. The default Correction Factor is 75
µ
S in duration. The
Correction Factor can be changed within the range 0 to 200
µ
S by sending the new value in
the module’s output data. An example is illustrated below. In the diagram,
T
0 is the OFF
Time, which is
Correction
f
+
2
1
, where
f
is the pulse frequency.
f
T
2
1
1
=
,
T
2 = Optical Isolator Delay, and
T
1+
T
2 = ON Time.
T 2
T 1
T 0
T 2
T 1
T 0
O u tp u t
V o lta g e
T im e
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