User guide

64 6250 Servo Controller User Guide
You can connect the 6250's programmable I/O to a bank of thumbwheel switches to allow operator
selection of motion or machine control parameters.
The 6250 allows two methods for thumbwheel use. One method uses Compumotor's TM8 thumbwheel
module. The other allows you to wire your own thumbwheels.
The TM8 requires a multiplexed BCD input scheme to read thumbwheel data. Therefore, a decode
circuit must be used for thumbwheels. Compumotor recommends that you purchase Compumotor's
TM8 module if you desire to use a thumbwheel interface. The TM8 contains the decode logic;
therefore, only wiring is needed.
The 6250 commands that allow for thumbwheel data entry are:
Command Description
INSTW Establish thumbwheel data inputs (TM8)
OUTTW Establish thumbwheel data outputs (TM8)
TW Read thumbwheels or PLC inputs
INPLC Establish PLC data inputs (Other thumbwheel module)
OUTPLC Establish PLC data outputs (Other thumbwheel module)
Using the TM8
Module
To use Compumotor's TM8 Module, follow the procedures below.
Step ➀ Wire your TM8 module to the 6250 as shown below.
Optional Sign Bit
Programmable Input #1
Programmable Input #2
Programmable Input #3
Programmable Input #4
Programmable Input #5
6250
Servo Controller
Pin #49 (+5VDC)
Pin #48 (GND)
Programmable Output #1
Programmable Output #2
Programmable Output #3
+ 1 2 3 4 5 6 7 8
+5 GND I5 I4 I3 I2 I1 O5 O4 O3 O2 O1
TM8 Thumbwheel Module
Step ➁ Configure your 6250 as follows:
Command Description
> OUTTW1,1-3,Ø,1Ø Configure thumbwheel output set 1 as follows: outputs 1-3 are
strobe outputs, 10 ms strobe time per digit read. The minimum
strobe time recommended for the TM8 module is 10 ms.
> INSTW1,1-4,5 Configure thumbwheel input set 1 as follows: inputs 1-4 are data
inputs, input 5 is a sign input.
> INLVLØØØØØ Inputs 1-5 configured active low
Step ➂ Set the thumbwheel digits on your TM8 module to [phone]. To verify that you have wired your
TM8 module(s) correctly and configured your 6250 I/O properly, enter the following commands:
Command Description
> VAR1=TW1 Request distance data from all 8 thumbwheel digits
> VAR1 Displays the variable—*VAR1=+Ø.12345678. If you do not
receive the response shown, return to step 1 and retry.