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2-33
Part 2: Connections and Interface
Dedicated Digital I/O - Enhanced I/O Set
Step/Direction/Clock I/O
These dedicated I/O lines are used to
receive clock inputs from an external device
or
provide clock outputs to an external device
such as a counter or a second MForce
MicroDrive in a system.
The Clock I/O can be con-
figured as one of three clock types using the
S7 and S8 variable:
1. Step/Direction
2. Quadrature
3. Up/Down
Step/Direction
The Step/Direction function
would typically be used to receive
step and direction instructions
from a second system MForce
or secondary controller. When
configured as outputs the MForce
can provide step and direction
control to another system drive
for electronic gearing applications.
Quadrature
The Quadrature clock function
would typically be used for
following applications where
the MForce would either be a master or slave in an application that would require two MForce
MicroDrives to move the same distance and speed.
Up/Down
The Up/Down clock would typically be used in a dual-clock direction control application, or to
increment/decrement an external counter.
NOTE: When
using the MForce
MicroDrive2 with the
external encoder
option, the step an direction
I/O are not available! These I/
O points become Index + and
Index -. See the Closed Loop
Control Appendix for encoder
connection and configuration
information.
Step Clock
Direction
Channel A
Channel B
CW
CCW
Step/Direction Function
Quadrature Function
Up/Down Function
Input: S<7-8>=33, <active state>
Output: S<7-8>=49,<active state>
Input: S<7-8>=34, <active state>
Output: S<7-8>=50,<active state>
Input: S<7-8>=35, <active state>
Output: S<7-8>=51,<active state>
Figure 2.4.13: MForce MicroDrive Clock Functions
NOTE: Advanced
I/O interface circuit
diagrams and
application examples are
available in the I/O Application
Guide Appendix.
IOGND
Vin Max = +5 V
Vin Hi = 1.86 V
Vin Low = 0.9 V
Iin Hi = 1 mA
Iin Low = -0.8 mA
Vo Min = 2 V
Vo Max = 5 V
Iosc Min = 35 mA
Iosc Max = 250 mA
STEP_IO
T
R
DIR_IO
T
R
ENABLE SDIO
Step In
Step Out
Dir In
Dir Out
Step Clock/Channel A/Clock Up
Direction/Channel B/Clock Down
MForce
When used as an input a
10kΩ Bias resistor is
required.
Figure 2.4.14: Step Direction I/O Equivalent Circuit
WARNING: The
Clock I/O and
Capture/Trip
I/O are TTL Level
compatible. DO NOT Exceed
+5VDC!