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ADVANCED MICRO SYSTEMS, INC. HARDWARE
10
As an output (as shipped) the signal can be redefined as a stepping pulse output with the “l 2” (lower case
L) command. This also defines P5 as a direction output signal.
Port 5
Port 5 is an output port/driver, rated at 2-amps. The output signal can be redefined as a direction output with
the “l 2” (lower case L) command. Port 4 becomes a step pulse output.
The output signal can be redefined as a moving output with the “l 4” (lower case L) command. The moving
output is useful in designs where a PLC or computer cannot interrogate motion status using serial
communications (the preferred method).
The FET transistor ratings are RDSon=.065 ohm, VDS= 55-volts and ID=17 amps (because the FET
transistors are not heat-sunk, never draw more than 3 amps) Damage caused from miss application of these
devices is not covered by warranty.
Typical Output Circuit
The default “off” condition is non-conducting (5-volts) when a port is turned on (such as the “A 16”
command). The output will conduct to zero volts (Ground) at up to the rated current of 16 mA, DC.
Encoder Input Option (J1)
This option does not support “Encoder Feedback”
The DCB-274 is available with step and direction or encoder inputs. Depending on the option, either step
and direction or optional encoder phase A and phase B can be used. Several features and cautions must be
observed.
1. The position counter will follow the input step/direction (or A/B) inputs.
2. The limit switches function, with direction sensitivity.
3. The minimum pulse low time is 7 microseconds.
4. Stepping occurs on the rising edge of the pulse.
5. The direction must be setup prior to the rising step edge.
6. Direction must be held for >10 microseconds after the rising step edge.
7. Motion commands will conflict with these inputs.
8. The maximum step rate is 16,000* pulses per second.
*Higher step rates may be possible on some products. Contact AMS for details.
Mosfet
VIO
Output Pin
Load
+
-
Optional Clamp
Buffer
SMC-26
Microprocessor