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Series SixTM PLC
High Density TTL
Output Module
July, 1989
General Description
The High-Density Transistor Transistor Logic (TTL)
Output module, with indicating Light-Emitting
Diodes (LEDs, can be utilized in an I/O rack, or in
any of the 1/O slots in a Series Six Plus Central
Processor Unit (CPU), to provide a compact, optitally-isolated interface between the backplane I/O bus
and field digital circuitry (TTL).
Each module provides 32 active low outputs divided
into 4 groups, each containing 8 outputs. All 32
outputs (4 groups) are normally updated in the course
of one I/O scan. A common return point connects the
32 loads on the High-Density TTL Output module.
The placement of a jumper allows the selection of
disabling all outputs during a reset condition or the
holding of the last state presented to the outputs even
if a reset or failure should occur.
By placement of a second jumper on the module the
user can select whether the data received from the
CPU is inverted (complemented) or non-inverted
before controlling the outputs. Two LED indicators
identify the selected modes of operation.
The module is supplied in one version with 32 LEDs
(one for each output) indicating the state of each output individually. A particular LED will be illuminated whenever its corresponding output is on.
The High-Density TTL Output module features and
benefits are summarized in Table 1. Refer to Table 3
for module specifications.
Table 1, Features and Benefits
32 TTL (Logic Level) output points per module.
Low cost per output point.
Efficient use of I/O rack space.
Output Indicating lights.
Visual indication at the module of the OFF/ON state of
the outputs.
Programmable hold last commanded state of outputs.
The last commanded output states are retained throughout
a Series Six power-down or system fault so long as the
user power is uninterrupted.
Interface from CPU to:
Devices having TTL or CMOS inputs
Other low voltage
Low current loads
Compact I/O System
High Density TTL
The High-Density TTL Output module can be
installed in an I/O rack or in a Series Six Plus CPU
Before installing the module, the
Dual-In-line-Package (DIP) switches immediately
behind the card slot on the rack backplane should be
set to reserve 32 consecutive bits in the appropriate
output status table of the CPU. For specific DIP
switch settings, refer to Table 2.
The circuit-board jumpers must be set to configure the
module to operate in the desired system configuration.
For example: invert or non-invert and disable outputs
or hold last state. Refer to Figure 1, User Items.
The response to a power-down or Series Six system
fault is defined by jumper 1 (JPl). Position l-2 (DISABLE OUTPUTS) turns all outputs OFF in such
cases. Position 2-3 (HOLD LAST STATE) would
maintain the last commanded state of the outputs until
new valid data is presented or user power is removed.
In either case all outputs are initialized OFF when
user power is turned on.
Jumper 2 (JP2) determines what state commanded by
the CPU is used to tum an output ON. In the Normal
mode (non-inverting) the ON state (active low output)
results when a logical 1 is in the Output Status Table.
Conversely, an OFF state (output high) exists with a 0
in the Output Status Table. Just the opposite output
state versus output status table exists if the module is
placed in the Inverting mode.
When using a High-Density Output module to drive a
High-Density Input module, both modules should be
configured in the same mode (Inverting or
Non-Inverting). Following this procedure ensures
that the bit values sent from the Output Status Table
to the Input Status Table are not inverted.
It is recommended that the extraction/insertion tool
furnished with the CPU be used to remove or install
the circuit boards. With the board in place in the rack,
the edge connector on the faceplate should be slipped
over the circuit board so that the proper contact is
made. The faceplate can then be secured to the rack
using the thumbscrews at the top and bottom.
Refer to Figure 2 for a typical symbolic output circuit.
Refer to Figure 3 for typical user connections to this
module. If active-pullup outputs are desired with this
TTL module, the PUL terminal should be connected
to the positive terminal of the output supply (0 to 15
V dc). For open-collector operation, the PUL terminal should be left open (no connection).
High Density TTL
Table 3. Specifications
Storage Temperature:
Operating Temperature:
Power Requirements:
User Supplied Power:
Output Capabilities:
Response Time:
Circuit Board: 8.15 x 11.0 (inches) 208 x 280 (mm)
Faceplate: 12.46 x 1.175 (inches)
317 x 30 (mm)
-20” to +8O*C
0” - 60 “C at the outside of rack.
5 to 95% (non-condensing)
Up to 10,000 feet above sea level (operating),
Series Six common to user common.
2000 V dc for one second (maximum)
240 V ac 50/60Hz continuous (maximum).
Rate of change (noise immunity) 500 V/microsecond
Supplied by I/O rack or Series 60 rack:
+5 V dc, 180 mA maximum or 3 power units.
Ref. Chapter 2 section 2, I/O module load, Installation
and Maintenance Manual, GEK-25361.
To user on module logic at terminal 33.
Voltage including ripple 5 0.25 V dc
Current: 550 mA (with status indicating LEDs)
To user output pull up at terminal 34.
Voltage including ripple 0 to 15 V dc
Equivalent load resistance = 1.3K number of outputs
ON state, output low
Module acts as a current sink.
’ 25 milliamps per output for TTL compatibility 0.5 V dc.
50 milliamps per output point maximum 1.0 V dc.
OFF state, output high.
Open collector operation if PUL (terminal 34) is left
Sources current as voltage source equal to terminal 34
voltage minus 0.6 volts in series with 1.3K resistor.
ON to OFF or OFF to ON, 40 microseconds maximum.
High Density TTL
For previous revisions of 5V TI’L Output modules (911A and 911B) see GEK-83530.
Table 4. Ordering Information
Circuit Board and
5V TTL Output With Status Indicators
Circuit Board Only
Faceplate Only
Catalog Number Revision Suffix
The equipment iisted above having the catalog numbers shown and the same equipment having a higher alpha
suffix is designed for listing by UL for use as auxiliary control devices. The equipment is a direct replacement for
equipment having the same catalog number but a lower alpha suffix.
[email protected] L
This symbo1 on the nameplate means the product is listed by Underwriters Laboratories Inc. (UL
Standard No. 508, Industrial Control Equipment, subsection Electronic Power Conversion Equipment.)
For further information, contact your local GE Fanuc sales office.
GE Fanuc Automation North America, Inc., Charlottesville, Virginia
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