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GE 8122-DI-DC 16-channel DI, 24Vdc isolated, sinking

GENERAL

DO modules can provide up to 4 or 8 discrete

outputs, depending upon module type. Line

fault detection is also provided on the 2/1

modules for both open- and short-circuit

conditions.

Output Mode

The DO module outputs may be configured

for one of three different types of output:

• Discrete

• Single pulse

• Continuous pulse

Discrete

The Bus Interface Module (BIM) or Controller

signals an ON or OFF condition on demand.

Singe Pulse (See Notes 1 & 2)

This is an individual “single-shot” action,

creating a single ON pulse of specified duration that occurs at a definable time. The

pulse on-time can be varied between 2ms

and 130s in increments of 2ms. If a new ON

command (i.e. trigger) is given during the ON

period the pulse will restart. If a new pulse

width is supplied during the ON period, it

will not take effect until the next ON period.

A pulse can experience a small amount of

time dither that depends upon the amount of

Railbus activity. This can be ± 1% of the pulse

width or ± 3.5 ms, whichever is the longer.

Continuous Pulse (see Notes 2, 3 & 4)

This type of output provides a continuous

pulse train that is defined by the pulse ontime,

and the pulse period (the time between the

start of each ON time). The pulse period is

configurable to any value between 4 ms and

130,000 ms in 2 ms steps. The pulse on-time

is the same as for the momentary action

described above. The on-time must not

exceed the setting for the pulse period. (See

also the above note regarding AC modules.)

Pulses can experience a small amount of

time dither that depends upon the amount of

Railbus activity. This can be ± 1% of the pulse

period, or ± 3.5 ms, whichever is the longer.

Continuous pulse operation has two distinct

modes—static and dynamic. When in static

mode, the pulse parameters are cleared

from memory when the channel is made

inactive; in dynamic mode the values are

retained for use when the channel is made

active once again.

Line Fault detection (2/1 only)

When enabled, this will cause a flag to be set

to indicate a short or open circuit fault even

when channel output is in OFF state.

MODULE OPERATING STATES

Failsafe mode

The module supports failsafe mode as

defined in the earlier I/O module introductory

section, with the following two additions:

1) Channel using “Configured

failsafe values”

In this mode, the module will force the

outputs to predefined levels— defined on

a per channel basis.

On entering “failsafe”:

a) If channel is in Static mode of operation: Pulse mode is disabled and the

channel is configured as a latched

output and is driven to its failsafe

value.

b) If channel is in Dynamic mode of

operation: If in single pulse (momentary) mode, the configuration is not

cleared, but the output is driven to its

failsafe value.

On leaving failsafe:

Channel will adopt the mode defined

below for a channel going from inactive

to active state

2) Channel using “Hold last value”

If the module goes into failsafe during a

single pulse, it is allowed to complete the

pulse before adopting the failsafe state. A

latched (discrete) output will remain at its

current value.

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