Module Overview
The 3502 module is a one-axis stepper controller that occupies one slot in a SLC 500 rack.
This unit receives profile data from the PLC and outputs Step and Direction signals or
Clockwise/Counter Clockwise pulses to a stepper driver. Inputs on the module allow for homing,
over travel, and emergency stop. A 5V differential incremental encoder can be attached to the
unit to provide feedback information.
The 3502 module uses 8 input and 8 output registers to communicate with the PLC. Status
bits, the Current Position, and Encoder Count Value, are reported to the Input Registers. The 8
output registers have two purposes. First, they are used to configure the module with
parameters such as Output Type, Homing Type, Inputs Used, Input Active Level, and Starting
Speed. Second, they are used to send the move commands, along with the distance, speed,
and acceleration and deceleration rates used to define the move profile.
Some of the data used by the 3502 can exceed 32767, the value that can be contained in one
16 bit register. Because of this, these parameters are divided into two words, the Most
Significant Word (MSW) and the Least Significant Word (LSW). The MSW has the 1000s places
and the LSW has the 1s, 10s and 100s places. Negative values are handled using a sign
magnitude format where the Most Significant Bit in the MSW is set to indicate a negative value.
For example:
Value
-12,345
12,000
-12,000
Because the 3502 module does not use a non-volatile memory, it must be configured at every
power up.
Sample programs for the 3502 are available from the following page of our website.
https://www.amci.com/industrial-automation-support/sample-progams/
Waste Electrical and Electronic Equipment (WEEE)
At the end of life, this equipment should be collected separately from
any unsorted municipal waste.
20 Gear Drive, Plymouth Industrial Park, Terryville, CT 06786
Tel: (860) 585-1254
Fax: (860) 584-1973
MSW
(decimal)
-32,756
12
-32,756
345
0
-345
-32768
Web:
SLC 500 Motion Controller
MSW
LSW
(hex)
(decimal)
16#800C
345
16#000C
0
16#800C
0
16#0000
345
16#8000
345
www.amci.com
3502 Module
LSW
(hex)
16#0159
16#0000
16#0000
16#0159
16#0159
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Manual Revision 1.0
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