artisan VX414C, User Manual

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3.0 FUNCTIONAL DESCRIPTION
3.1 GENERAL
VX414C is a general purpose switching module that provides individual switches for controlling
external devices and routing general purpose signals. The module provides 16 channels of Form-
A relays and 48 channels of Form-C relays with external access via a front panel connector. Each
Form-A channel includes a SPST non-latching relay with the two contact terminals of each relay
brought out through the front panel connectors. Each Form-C channel includes a SPDT non-
latching relay with the three contact terminals (COM, NO, NC) of each relay brought out through
the front panel connectors.
A functional block diagram is shown in Figure 1.
CONNECTORS
VXI
ADDRESS
DECODE
LOGIC
DATA
BUFFER
CONTROL
LOGIC
DATA
LATCHES
RELAY
STATUS
RELAY
DRIVERS
CONTROL
LOGIC
CONTROL
LOGIC
VXI ADD BUS
VXI DATA BUS
CONTROL LOGIC
FRONT PANEL CONNECTIONS
16 SPST RELAYS
K1-K14
K0
IN OUT
K15
IN OUT
FRONT PANEL CONNECTIONS
48 SPDT RELAYS
K16
K63
K17-K62
NC COM NO NC COM NO
Figure 1. Functional Block Diagram
3.1.1 VXI Interface
The VXI interface, consisting of the VXI connectors, address decode logic, control logic and data
buffer, provides the electrical and mechanical connections to the VXI backplane. It performs
address decoding and bus buffering functions.
3.1.2 Data Latches
Programming of the module is through direct register access. There are 64 independent relays on
the module which are controlled using the relay control registers. The relay control register
receives relay control data from the VXI interface and latches it into registers. Module reset
results in these registers being cleared to a low output.
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