Alcorn Mcbride 1746-SMPTE Bedienungsanleitung
1746-SMPTE
User’s Guide
by Alcorn McBride Inc.
Document Revision 1.0
September 1997
Copyright 1997 Alcorn McBride, Inc. All rights reserved.
Every effort has been made to assure the accuracy of the information contained
in this manual, and the reliability of the hardware and software. Errors
sometimes can go undetected, however. If you find one, please bring it to our
attention so that we can correct it for others.
Alcorn McBride Inc. reserves the right to make changes to these products,
without notice, in order to improve their design or performance.
Applications described herein are for illustrative purposes only. Alcorn McBride
Inc. assumes no responsibility or liability for the use of any of these products,
and makes no representation or warranty that the use of these products for
specific applications will be suitable without further testing or modification.
Our Show Control equipment is not intended for use in applications where a
malfunction can reasonably be expected to result in personal injury or damage to
equipment. Customers using or selling Alcorn McBride Inc. products for use in
such applications do so at their own risk, and agree to fully indemnify Alcorn
McBride Inc. for any damages resulting from such improper use or sale.
The 1746-SMPTE incorporates technology which is licensed from Allen-
Bradley Company, Inc. Allen-Bradley has not technically approved, nor does it
warrant or support the 1746-SMPTE. All warranty and support for the 1746-
SMPTE and its application is provided solely by Alcorn McBride.
Product Design: Jim Janninck, Jason Crew and Steve Alcorn.
Documentation: Jim Janninck
Alcorn McBride Inc.
3300 S. Hiawassee, Suite 105
Orlando, Florida 32835
(407) 296-5800
FAX: (407) 296-5801
http://www.alcorn.com
Contents
Welcome 1
What is SMPTE Time Code?.....................................................................................................1
Technical Support......................................................................................................................2
Installing the 1746-SMPTE 3
Setting the SMPTE Output Level ..............................................................................................3
Module Power Consumption .....................................................................................................3
Installing the Module in the SLC 500 Chassis...........................................................................4
Wiring the Module.....................................................................................................................4
Module I/O Space 5
Output File .................................................................................................................................5
Input File....................................................................................................................................6
Using the Module as a SMPTE Generator 7
Generator Theory of Operation..................................................................................................7
Configuring the Generator .........................................................................................................8
Controlling the Generator ........................................................................................................10
Monitoring the Status of the Generator....................................................................................11
Typical Applications & Sample Rungs....................................................................................13
Using the Module as a SMPTE Reader 17
Reader Theory of Operation ....................................................................................................17
Configuring the Reader............................................................................................................18
Controlling the Reader.............................................................................................................19
Monitoring the Status of the Reader ........................................................................................20
Typical Applications & Sample Rungs....................................................................................21
Welcome 1
Welcome
Welcome
Since the first V16 was introduced in 1986, Alcorn McBride has been providing
high quality show control solutions to the entertainment industry. The 1746-
SMPTE module brings that same power to the Allen-Bradley family of
programmable logic controllers. We at Alcorn McBride are pleased to provide
you with these tools. Good luck, have fun, and thanks for choosing
Alcorn McBride!
What is SMPTE Time Code?
Think for a moment about any recorded performance. It could be a stereo
recording of a symphony orchestra, a video of your child’s birthday party, or
your favorite motion picture. It would be very desirable to know the length of
the performance, and to be able to jump in to any point in the recording
accurately. Early systems provided such capabilities by linking a mechanical
counter to the tape or film reels. By counting revolutions of the reel, one could
return to the same point in the recording repeatably, and get some sense of the
overall length of the piece.
Mechanical or electronic counters work very well. In fact, they are still in
widespread use in much of today’s audio and video equipment. However, they
do have drawbacks, such as the lack of consistency from one machine to
another, and the fact that the counts can change when the tape gets edited or
copied.
A far more accurate system would encode the time information as a part of the
presentation itself, perhaps as an additional track of a multi-track audio
recording. This is exactly the technique that was standardized in 1981 by the
Society of Motion Picture and Television Engineers (SMPTE) and subsequently
adopted by the European Broadcast Union (EBU). The complete standard was
published as ANSI V98.12M-1981, and is generally known as the SMPTE/EBU
Longitudinal Time Code, or more simply, SMPTE Time Code.
To achieve film-like editing capability, SMPTE Time Code represents time in
hours, minutes, seconds, and frames. The common frame rates are 24 frames
per second for film work, 25 frames per second for European television, 30
frames per second for NTSC black and white television, and 29.97 frames per
second for NTSC color television. A typical SMPTE readout looks like
02:28:35:15, indicating 2 hours, 28 minutes, 35 seconds, and 15 frames.
2 Welcome
SMPTE Time Code is often used to synchronize various elements of a complex
presentation. Equipment such as film projectors, video sources, audio systems,
lighting consoles, and motion controllers can read the time code to remain at the
proper point in the show at all times.
The 1746-SMPTE brings the ability to read and generate SMPTE/EBU time
code to the Allen Bradley family of programmable logic controllers. The
module is compatible with all processors in the SLC 500 family, including the
5/01, 5/02, 5/03, and 5/04 processors.
Technical Support
You can obtain information about specifying, installing, configuring, and
programming your Alcorn McBride 1746-SMPTE from several sources:
For… Contact… When?…
Telephone Support (407) 296-5800 M-F 9am–6pm (EST)
Fax Support (407) 296-5801 M-F 9am-6pm (EST)
Installing the 1746-SMPTE 3
Module
Setup
Installing the 1746-SMPTE
The Alcorn McBride 1746-SMPTE plugs directly into a standard SLC 500 PLC
chassis. The module is compatible with all SLC modular processors, including
the SLC 5/01, 5/02, 5/03, and 5/04.
Setting the SMPTE Output Level
If the module is being used to generate SMPTE time code, set the SMPTE time
code output level before installing the module in the chassis. The 1746-SMPTE
includes one eight-position switch, labeled SW1 on the circuit board, to select
the output level, measured in volts peak to peak.
Switch SW1 Settings
12345678
4.0 Vpp On Off Off Off Off Off Off Off
3.5 Vpp Off On Off Off Off Off Off Off
3.0 Vpp Off Off On Off Off Off Off Off
2.5 Vpp Off Off Off On Off Off Off Off
Output Level
2.0 Vpp Off Off Off Off On Off Off Off
Module Power Consumption
The 1746-SMPTE module draws a maximum of 0.350 Amps at 5 VDC. The
module does not use the 24 VDC power supply.
4Installing the 1746-SMPTE
Installing the Module in the SLC 500 Chassis
Attention! Never install or remove any module while power is applied.
Installing the Module
Align the module circuit board with the card guides in the chassis.
Gently push the module in until it is firmly seated, with the retaining clips
engaged at the top and bottom.
Removing the Module
Press the retaining clips at the top and bottom of the module and slide the
module straight out of the chassis.
Wiring the Module
Attention! Never wire any module while power is applied.
The module wiring terminals accept two wires per terminal (maximum) of
14 AWG or smaller stranded wire. Maximum screw torque is 8 in-lb.
The module terminal block is removable. Simply unscrew the upper right and
lower left release screws and pull the entire terminal block straight out. When
replacing the terminal block, alternate the tightening of the release screws to
avoid cracking the block. Maximum screw torque is 8 in-lb.
SMPTE Input
When the 1746-SMPTE is used to read external time code, the signal is
connected to this input. The input is transformer balanced with a 600 ohm
characteristic input impedance, and can accept signals from 2 Vpp to 5 Vpp.
Connect the positive drive to the terminal labeled ‘IN (+)’ and the negative drive
to the terminal labeled ‘IN (-)’. There is no terminal for the cable’s shield; it
should be connected to the chassis ground at the other end of the cable.
SMPTE Output
When the 1746-SMPTE is used to generate or regenerate time code, the signal
comes out of this output. The output is transformer balanced to drive a 600 ohm
load, and can output signals from 2 Vpp to 4 Vpp, as selected by switch SW1.
Connect the terminal labeled ‘OUT (+)’ to the positive drive and the terminal
labeled ‘OUT (-)’ to the negative drive. There is no terminal for the cable’s
shield; it should be connected to the chassis ground at the other end of the cable.
Module I/O Space 5
Module
I/O
Module I/O Space
The 1746-SMPTE module uses ID code 3535, which indicates that it is a Class 1
module with I/O mix of 8 input words and 8 output words and I/O type of third
party. All communications with the 1746-SMPTE takes place through the
Output and Input Data Files. The module occupies eight words in the Output
File and eight words in the Input File.
Output File
The eight words in the output file configure and control the SMPTE module.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 x x x x x Frame Rate Mode Mute x Loop x Set Stop Run
1 Dropout Tolerance
2 Set Hours Set Minutes
3 Set Seconds Set Frames
4 Loop Start Hours Loop Start Minutes
5 Loop Start Seconds Loop Start Frames
6 Loop End Hours Loop End Minutes
7 Loop End Seconds Loop End Frames
Module Output File
The next two chapters contain complete descriptions of the function of each
word in the Output File.
Bits marked ‘x’ are reserved for future use. They should always be set to zero.
6Module I/O Space
Input File
The eight words in the input file indicate module status to the PLC.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 Hours
1 Minutes
2 Seconds
3 Frames
4 x x x x x Drop Gen Lock Frame Rate
5 Error Codes
6xxxxxxxxxxxxxxxx
7xxxxxxxxxxxxxxxx
Module Input File
The next two chapters contain complete descriptions of the function of each
word in the Input File.
Bits marked ‘x’ are reserved for future use. They are all set to zero.
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