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ADVANCED MICRO SYSTEMS, INC. SMC-27X2 SOFTWARE
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Two or more flags can be specified for multiple options, i.e., flag 1 + flag 8= 9. So, command “l 9” will invert
limits and set PLC mode. When reading flags, the host software must convert decimal to binary to evaluate
the results.
Option table
Flag Bit Function Note
1 0 Invert limits Both inputs must be held low to allow a move.
2 1 Step/dir out Change port 4 and 5 into step and direction out. P4 is output (JP1, JP2)
4 2 Moving Change port 5 into moving signal. P4 is output (JP1, JP2)
8 3 PLC mode Inverts all input signals. Set PLC jumper
16 4 P4 input Inform the controller that port 4 is an input. Based on JP1, JP2
32 5 Gentle limit Soften limit with decelerate (K). Over shoots limit
64 6 Reserved
128 7 Read back Read out the values.
An “S” (save) command must be used to preserve the settings.
Default with CLEAR =all zero.
Limit Polarity (Flag 1)
The input levels on the travel limit sensors are inverted, allowing source type sensors such as hall-effect
devices to be used. This command cannot swap the limit directions. When this bit is set, motor travel in
either direction is inhibited unless the appropriate limit inputs are forced low. The PLC mode will invert the
logic levels (sourcing input necessary to trigger a limit).
Example:
l 1 Invert the limit software.
l 9 PLC - invert limit software and input logic.
Make Step and Direction Outputs (Flag 2)
This option converts port 4 to a step output and port 5 to a direction output. These signals can be directed
to “slave” driver(s) to control additional motors if required. The step outputs are short negative going
pulses.
Port 4 logic must be configured (JP1, JP2) as an output. The step and direction outputs can be a very
powerful feature as it allows the user to send step pulses and a direction bit to a stand-alone driver, moving
it at the same rate and direction.
Conflicts - Flags 4 and 16 must be off.
Moving Output (Flag 4)
This flag converts output P5 into a moving status signal. While motion is active, port 5 will be at zero volt
level. Several axes may be wire-or’ed together to form an “any axis moving” signal.
Conflicts - Flag 2 is not allowed.
PLC Mode (Flag 8)
This option tells the controller that all inputs are inverted, and to compensate accordingly. The PLC jumper
MUST be installed, This jumper reconfigures the input hardware with pull down rather than pull ups. The
inputs will read zero volts. A positive voltage must be applied to any of the affected inputs (such as GO) to
trigger the “true” condition. If both GO and Soft Stop are true at power up, then a conflict message (single
mode) is displayed and flag 8 will be temporally set to prevent a latch up condition.