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Installing the VM24 3
Overview — VM24
The VM24 external I/O modules act as an interface for the general-purpose
programmable inputs and outputs of all the 6000 Series servo and
microstepping products. The VM24 module consists of a base board and one
to three SIM (single in-line module) style boards that can be inserted to
provide the user with a scaleable solution for their input and output needs.
• The outputs are enhanced by an undervoltage lockout circuit and a
thermal shutdown protection circuit. These outputs operate over 5VDC
to 24VDC, will sink 50 mA to 0.4VDC or 300mA to 2.5VDC, and
will source 50 mA to a voltage level of V
o
– 2VDC (user-supplied
voltage level V
o
minus 2 volts, e.g. for V
o
=24V, output is 22V) or
300 mA to a voltage level of V
o
– 2.5VDC (user-supplied voltage
level V
o
minus 2.5 volts, e.g. for V
o
=24V, output is 21.5V).
• The inputs are enhanced by decompression, hysteresis, high-frequency
filtering, and overvoltage clamping. These inputs, capable of operating
in sinking or sourcing mode, have a range from 5VDC to 24VDC. The
switching level for inputs is based on the user-supplied voltage V
i
, such
that OFF ≤1/3 (V
i
) and ON ≥ 2/3 (V
i
), with hysteresis of 1/3(V
i
).
(For example, with V
i
of 24VDC, OFF ≤ 8VDC and ON ≥ 16VDC,
with 8VDC of hysteresis.) Jumpers are used to configure the inputs as
sinking or sourcing. Each of the three SIM sockets has its own
corresponding jumper, allowing each input SIM to be independently
configured.
The VM24 module accepts a 50-pin ribbon cable from the 6000 Series
product and provides screw terminal connections for easier interface with the
user's application. The 24 I/O signals to/from the 50-pin DIN connector and
the 50-pin screw terminal are interrupted by three SIM sockets (each SIM
interrupts an 8-bit group of signals).
Optical isolation is inherited from the 6000 product, except for OEM
products. (I/O ground is isolated from microprocessor ground, but inputs and
outputs are not isolated from each other.)