GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 171)

Discrete inputs/outputs 167
10
10 Discrete I/O
10.1 Discrete inputs/outputs
Entellisys provides support for up to 128 discrete I/O points that can be configured as either
inputs or outputs. Purchase of separate hardware is required. Discrete I/Os are controlled by the
FlexLogic™ program (see
FlexLogic™ on page 185 ). Their functionality can be divided into two
separate components: hardware and software, described in the corresponding sections below.
10.1.1 Hardware
Slots PMC0 and PMC1 on the CPU board each accommodate one discrete I/O board. Hardware
requirements also include an “OR” board, relays and relay blocks, described in detail in the
corresponding sections. Discrete I/Os can be wired in two distinct configurations. One
configuration allows for redundancy of discrete I/Os and the other that is non-redundant. The
latter configuration can be used when uptime and reliability is not as important. These
configurations are described in corresponding sections below.
10.1.1.1 Non-redundant discrete I/O
Discrete I/Os can be wired in two configurations: non-redundant and redundant.
Non-redundant configurations allow one CPU to manage up to 128 discrete I/O points. In this
configuration, a second CPU can have no installed discrete boards.
Figure 10-1 Discrete I/O in non-redundant configuration
V+ V-
PMC464
Input
Relay
Block Block
Relay
Input
Block
Relay
Output
Power Supply
Terminal block
Common from associated
PMC464 card
Common from
associated PMC464
card
Signal Lines
To devices
associated PMC464
Common from
card
PMC464