Woodward MicroNet TMR 5009, Installation/Hardware Manual

Page: 18 / 118

5009 Installation/Hardware Manual 85580V2
10 Woodward
Discrete I/O Module (A4)
Each Discrete input/output (I/O) module receives status information from 24
discrete inputs, controls 12 relay outputs and provides latent fault detection for
each relay output. Field wiring is isolated from the 5009 circuitry through optical
isolators on each input channel, and relays on each output channel.
Figure 2-7 is a diagram of the Discrete I/O module. Each CPU sends and
receives information to and from its respective Discrete I/O module via the VME
bus. Each input status is stored in a register and addressed by the CPU as
required. Output commands are driven by the CPU to the Discrete I/O module’s
associated output latches. These latches control the state of output drivers to
energize and de-energize relays. Output Relays are located on the Discrete
Termination Modules.
Each output channel has a readback buffer that stores and indicates the status of
the output driver and associated relays. The CPU compares this status to the
value written to the channel and generates a fault signal if these values are
different.
Figure 2-7. Discrete Input/Output Module
Discrete Termination Modules (F/T Relay Module)
Discrete Termination Modules (DTMs) mount external to the 5009 chassis on a
panel or in a cabinet. The discrete termination modules are used to connect
discrete field wiring to the 5009 control. Four DTMs are provided and used with
each 5009 control. Refer to Figure 4-19 for an overview of modules and DTMs
used. Each DTM connects to the control’s three independent Discrete I/O
modules through individual cables, and provides a common cage-clamp terminal
connection for customer field wiring. A DTM contains circuitry for six contact
inputs, three relay outputs and houses circuitry to: