GFK-1504K Chapter 13 Mixed Discrete/High-speed Counter Module 13-19
13
IC200MDD841
Mixed Module, 24VDC Positive Logic Input 20 Points / Output 12 Point /
(4) High Speed Counter, PWM, or Pulse Train Configurable Points
Stop Ramp with Deceleration
The graphics below show how stopping a Ramp early affects the Ramp output if the output
is configured for deceleration. The example on the left shows what happens when the
Enable Bit is set OFF during the “at velocity” part of the output. The righthand example
shows the impact when the Enable Bit is set OFF during the “ramp up” part of the output.
Velocity (p/s)
Velocity (p/s)
Time Time
Note that if the Ramp output is already decelerating when the Enable Output bit transitions
from On to Off, there is no change to the operation of the Pulse Train output.
Configuration
When the module powers up or receives a new configuration, it automatically sets up all
Ramp channels to decelerate when the Output Enable bit goes OFF. If a Ramp output
should stop immediately, the channel can be reconfigured with a Data command or a
COMREQ. The data block is the same for both:
MSB LSB
Command word 0n 3B
Data word (LSW) dddd
Data word (MSW) Always zero
“0n” is the channel number from 1 to 4.
“3B” is the command (in hexadecimal): Load Stop Mode
“dddd” is the Stop Mode parameter. It can be “1” for Decelerate and “2” for
Stop Immediately. If any other value is specified, error code 13 (hex) is placed in
the Module Status Word.
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