Applied Motion RS-232 - Manual (Page 199)

199 920-0002 Rev. I
2/2013
Host Command Reference
SI - Enable Input Usage
Compatibility: All drives
Affects:
Enable input usage
See also: AI, CM, SD commands
BLu, SV, STAC6, ST-Q/Si
Sets or requests the usage of the Enable input. Input X3 is the default Enable input on all drives, however IN3 on
SE, QE and Si drives may also be designated as the Enable input (see below). If an external Enable function is
not needed input X3 and/or IN3 can be defined solely as a general purpose input. In this scenario only the ME
and MD commands will enable and disable the drive, respectively. When using the brake output (see BO, BD and
BE commands) the disabling of the drive is delayed by the time value set using the BD command.
There are five possible usage states for the Enable function:
SI1: Drive is enabled when X3 is open (inactive, high).
SI2: Drive is enabled when X3 is closed (active, low).
SI3: Neither X3 nor IN3 is used for enabling/disabling the drive, but as general purpose inputs.
SI4: Drive is enabled when IN3 is open (inactive, high). (SE, QE, and Si drives only).
SI5: Drive is enabled when IN3 is closed (active, low). (SE, QE, and Si drives only).
ST-S, STM17, STM23-Q/C, STM24-C
Defines the EN input as an Enable Input. If you want to use the EN input as an Enable input you can define it as
such in two ways, with the ST Configurator software, or with the SI command. SI takes no effect if the drive is set
in Command Mode (CM) 13, 14, 17 or 18, because these modes use the EN input as a speed change input and
take precedence over the SI command. Also, setting the AI command after setting the SI command reassigns
the EN input to Alarm Reset usage and turns off any drive enable usage (SI3). In other words, the AI and SI
commands, as well as Command Modes (CM) 13, 14, 17 and 18 each assign a usage to the EN input. Each of
these must exclusively use the EN input. Note: The STM24-C drive uses IN3 for the Enable Input.
There are three Enable input states that can be defined with the SI command:
SI1: Drive is enabled when the EN input is open (inactive, high).
SI2: Drive is enabled when the EN input is closed (active, low).
SI3: The EN input is not used for Enable and can be used as a general purpose input. SI will be automatically
set to 3 if CM is set to 13, 14, 17, or 18, or if AI is set to 1 or 2 after the SI command is set.
STM24-SF/QF
Drives with Flex I/O allow a second parameter which allows the user to specify the I/O point used. Before an I/O
point can be used as the Drive Enable input it must first be configured as an input with the SD command. See the
STM24 Hardware Manual for details of which inputs may be used as the Drive Enable input.
Possible uses for the SI command on the STM24 are as follows (‘n’ denotes the I/O point to be used):
SI1n: Drive is enabled when the designated input is open (inactive, high).
SI2n: Drive is enabled when the designated input is closed (active, low).
SI3n: The specified input (‘n’) is not used for Drive Enable and may be used as a general purpose input.