TTL Output Module
Cat. No. 1771OG
Installation Instructions
2
The TTL output module is shipped in a static-shielded bag to guard against
electrostatic discharge damage. Observe the following precautions when
handling the module:
Electrostatic Discharge Damage
ATTENTION: Under some conditions, electrostatic discharge
can degrade performance or damage the module. Observe the
following precautions to guard against electrostatic damage.
Wear an approved wrist strap grounding device, or touch a grounded
object to discharge yourself before handling the module.
Do not touch the backplane connector or connector pins.
If you configure or replace internal components, do not touch other
circuit components inside the module. If available, use a static-free
work station.
When not in use, keep the module in its static-shielded bag.
This section explains how to:
select the logic level
key the I/O chassis
install the module
make the wiring connections
Selecting the Logic Level
You can select one of two logic conditions:
If you choose:
Then:
Set Switch SW:
HIGH = TRUE logic
2.0 to 5.25V dc corresponds to logic ``1" (on)
SW1 - on, SW2* - on
LOW = TRUE logic
-0.2 to 0.8V dc corresponds to logic ``1" (on)
SW1 - off, SW2* - on
* SW2 setting is optional for HIGH-TRUE indicator.
Select high-true or low-true using the switch assembly inside the module.
Initial Handling
Installing Your Module