ICS Regent
®
PD-6035
Multiplexed I/O Modules
(T3491)
Issue 1,
Multiplexed I/O modules provide two RS-422 serial port
interfaces between the Regent system and ICS’s remote
multiplexed I/O Unit (MIU) equipment, providing an
economical interface to digital inputs and outputs. MIU
equipment is often used for matrix and mimic displays in
safety and fire and gas systems or low cost, remote simplex
input and outputs.
March, 06
Features
•
Occupies one slot in the I/O chassis.
•
Two isolated RS-422 serial ports for remote multiplexed I/O.
•
Supports up to 512 digital inputs and 256 digital outputs of
remote MIU equipment.
·
Individual front panel indicators on each module show module
active and fault status; and transmit, receive and fault status
for each port.
•
Serial ports can be used in simplex or duplex modes (with
2oo2 testing in dual mode).
·
1000 volt minimum electrical isolation between serial ports
and between serial and logic circuits.
·
TÜV certified, Risk Class 5, non-interfering.
Multiplexed I/O mo
remote MIU equipment up to 4000 feet (1220 meters) away at
19200 baud. The two serial ports of the Mux I/O module can
be configured for simplex or duplex mode. In duplex mode,
2oo2 voting is performed on the I/O data.
dules support multi-drop connection to
Industrial Control Services
1
Multiplexed I/O Module (T3491)
The following MIU equipment may be interfaced to the
Multiplexed I/O Module
· MIU3201
· MIU3202
· MIU3204
A typical simplex application for multiplexed I/O is shown in
Figure 1.
Multiplexed I/O Processor Unit
Multiplexed Input Unit (64 point)
Multiplexed Output Unit (64 point)
Figure 1. Typical Multiplexed I/O Configuration.
Module Operation
A block diagram of the multiplexed I/O module is shown in
Figure 2.
2
Industrial Control Services
Multiplexed I/O Module (T3491)
Figure 2. Block Diagram of Multiplexed I/O Module.
The Voter, FPGA and triple buffers provide
an interface to the
triplicated I/O Safetybus. The Mux I/O module receives
configuration data over the I/O Safetybus from the processor
modules. This information defines the types of Multiplexed
I/O Unit equipment connected to the Mux I/O module. The
information is stored in the module’s dual ported RAM
memory.
The RAM memory is arranged into four blocks. One block is
used to download the Mux I/O equipment configuration. The
second block is used for reporting fault conditions. A third
block is used f
or writing output data, and the fourth block is
used for reading input data. The on-board microprocessor uses
this information to read and write I/O data via the two serial
ports.
Testing and Diagnostics
PD-6035
Mar-06
Comprehensive testing and diagnostics are used to determine
correct operation to the Mux I/O Module and connected MIU
equipment.
3
Multiplexed I/O Module (T3491)
Standard Module Testing
Each module’s voter circuits are periodically tested by the
processor modules. Discrepant data are sent through one of
three legs of the I/O Safetybus to
determine whether the
module’s voter is able to outvote the incorrect data. A failure
to return the correct majority-voted result to the processors
produces an I/O module error indication at the processor
modules and a module fault indication at the I/O module.
Each type of module has a unique identification code that is
read by the controller. This code lets the controller know
which type of module is installed in each I/O chassis slot and
how to address that module and its points specifically. If a
mod
ule is removed, or is replaced with a module of a different
type, the processor modules will indicate I/O module errors.
Loopback logic tests periodically write data to the module and
then read it back to determine whether the module’s I/O bus
interface logic is functioning correctly.
Multiplexed I/O Module Testing
Additional tests are periodically performed to verify the
correct operations of the microprocessor, ROM, RAM and
serial interface to the remote MIU equipment. Detected
failures are reported back to the processor modules as either
fatal or non-fatal errors.
Fatal Errors
Fatal errors are reported when the diagnostics detect a failure
in the module’s electronics. For example, failures in the
microprocessor, RAM, or ROM are considered fatal errors. A
fatal error will result in a module fault indication.
Non-Fatal Errors
Non-fatal errors are reported when failures occur in
communications to the connected MIU equipment. These
failures would represent problems with the serial
communications cables, or the connected MIU processor.
These types of failures are indicated on the face of the module
as a Port fault.
4
Industrial Control Services
Multiplexed I/O Module (T3491)
Front Panel Indicators
Figure 3 shows the physical features of the Mux I/O module.
The front panel of the module contains active, and fault status
indicators for the module as well as transmit, receive, and
communications fault status indicators for each port.
PD-6035
Mar-06
5
Multiplexed I/O Module (T3491)
6
Figure 3. Multiplexed I/O Module.
Industrial Control Services
Multiplexed I/O Module (T3491)
Application
Active and Fault Status Indicators
These green and red LEDs indicate the overall health of the
MUX I/O module. During normal operation the green
ACTIVE indicator flashes at the controller's scan rate. If a
fatal module fault is detected the red FAULT indicator
switches on and the green indicator switches off. Refer to page
4
for descriptions of fatal module faults.
Port Status Indicators
Both of the multiplexed I/O module’s ports have transmit,
receive and communications fault status indicators.
The green T
normal transmission and reception of communications data.
The communications fault indicator is normally off. When a
non-fatal communications fault occurs, the red LED switches
on. Refer to page 4 for descriptions of non-fatal faults.
X and RX indicators turn on and off reflecting
Simplex Configuration
Most often the Mux I/O module is used in simplex
configuration. In this configuration, each of the two serial
ports are used to individually connect to MIU equipment.
module uses the downloaded configuration information to
read inputs and write outputs for each serial port.
Dual Configurations
To protect against communications failures related to the
serial cables, the module can be configured for duplex
operation. When configured this way, the Mux I/O module
communicates to the connected equipment by reading from
and writing to both communications ports. Each port is cabled
to the same MIU processors.
The Mux I/O module reads inputs from each port and stores
the information in separate areas in RAM. The RAM data is
2oo2 voted, so that when both data areas agree, the input data
is updated for the Regent processor modules.
The
PD-6035
Mar-06
7
Multiplexed I/O Module (T3491)
When output data changes state, the Mux I/O module writes
the output data to both ports. At the MIU processor, the
output data is 2oo2 voted, so that when the data agrees, the
outputs are updated.
When input data disagrees, the Mux I/O module reads the
input data three more times. If the disagreement persists, a
failure is reported.
Serial Port Cable Connections
The serial communications cables are connected to the screw
terminals located on the I/O chassis directly above and below
the slot where the module is installed. Figure 4 illustrates the
proper connections for the serial ports.
8
Industrial Control Services
Multiplexed I/O Module (T3491)
PD-6035
Mar-06
Figure 4. MUX I/O Module Serial Cable Connections.
Keying
The I/O chassis can be physically keyed to prevent accidental
damage caused by inserting a module into a slot wired for a
9
Multiplexed I/O Module (T3491)
different modu
le type. Figure 5 illustrates how the slot keys
are installed on the I/O chassis slot field wiring connectors.
The slot key positions for the multiplexed I/O module are
listed in Table 1.
10
Figure 5. Installing Slot Keys.
Industrial Control Services
Multiplexed I/O Module (T3491)
Module
Upper
Connector
Lower
Connector
T3491
4
2
Note:
Table 1. Slot Key Positions.
Fault Mode Jumper
The fault mode jumper is located behind the ID switch cover
in the lower left-hand corner of each I/O ch
of the fault mode jumper determines the module's response to
system level faults. Normally, the fault mode jumper’s
position causes all output modules in the I/O chassis to either
shutdown (turn off all outputs) or to hold (hold the last state)
after a system level failure occurs. An example of a system
level failure is the failure of two processor modules.
The MIU Output Units contain latching output circuits.
When a system level failure occurs, the MIU outputs will
remain in their last state. Configuring the I/O chassis fault
mode jumper for shutdown will not cause the MIU outputs to
turn off when a system level failure occurs.
assis. The position
Configuration
Each Mux I/O module is configured using the
I/O Configuration Editor. In the editor, you will perform the
steps described below to configure the module.
1) Set the Module Type:
Position the cursor on the module slot you wish to define.
Choose Set Module Type from the Edit Menu and select
T3491, 12x64 Matrix Interface Module f
2) Edit the Module Definition:
Choose Edit Module Definition from the Edit Menu. A
dialog box will open where you can begin to define the
Protocol (Single or Dual), the Baud Rate (19200 or 9600),
and the MIU Processors that will be connected to the Mux
I/O module.
W
INTERPRET
rom the list.
PD-6035
Mar-06
11
Multiplexed I/O Module (T3491)
Figure 6. The Matrix Interface Module Dialog.
3) Define the MIU Processors:
After selecting the Protocol and Baud Rate in step 2,
choose Edit ( or Insert) from the Matrix Interface Dialog
Box. Another dialog box will open where you can define
the configuration for the MIU Processor.
12
Figure 7. Configuring a Mux I/O Processor Unit.
Select the Mux I/O module port that the MIU processor
will be connected (1 or 2 if single protocol, 1 if dual
protocol). Enter the ID number for the MIU processor (2
Industrial Control Services
Multiplexed I/O Module (T3491)
Important!
Important!
through 15). You may also enter a description to annotate
the MIU processor definition.
Each MIU processor has an ID number that must be
unique from other processors connected to the same Mux
I/O mo
dule. This number should match the ID number set
by links on the MIU processor unit. Refer to the product
description for the MIU Processor for details on link
settings.
4) Define the MIU I/O Modules:
In the MIU Processor Definition Dialog Box, position the
cursor on one of the four possible Mux I/O Units and
choose Edit (or Insert). Choose Input Unit or Output Unit
from the New Multiplexed Unit Dialog Box.
If both Input Units and Output Units will be connected to
a single MIU processor, the
before the Input Units.
Output Units must be defined
Figure 8. The New Multiplexed Unit Dialog Box.
After selecting the type of I/O module a new dialog box will
open where you can enter a description to annotate the I/O
unit.
PD-6035
Mar-06
13
Multiplexed I/O Module (T3491)
Important!
14
Figure 9. The Mux Input Unit and Mux Output Unit Dialog
5) Edit each point:
Boxes.
Choose Edit from the Mux I/O Unit dialog box to define a
name and description for each point. In the Mux Input (or
Output) Point dialog box, enter names and values for
of the point configuration fields described below.
each
The first I/O point on the first I/O Unit is unusable. Do not
enter a definition for this point. For example, if you
configure four, 64-point Input Units for a single MIU
processor, the first input unit has only 63 usable inputs.
Do not define the first input on the first input unit. The
remaining three input units may have 64 inputs defined.
Industrial Control Services
Multiplexed I/O Module (T3491)
Figure 10. The Mux Input Point and Mux Output Point
Name
Dialog Boxes.
Also called the tag name, this is the name used in the
application program to reference an input point status or
control an output point. The name can be up to 12 characters
long.
Description
The 40-character field provides a place to describe the input or
output point definition. The description is used to help
document your system (it does not affect application program
operation).
Comm Protect
This field applies only to Mux output points. Marking the
Comm Protect check box protects the point from changes b
y
communications functions such as data write, forcing and load
initial value when Comm Protect is enabled.
PD-6035
Mar-06
Initial Value
This field applies only to Mux output points. The initial value
for the output is loaded to the Regent when you load the I/O
15
Multiplexed I/O Module (T3491)
Desired Output
State
Coil
--
( )--
Mux Coil
--
( M )--
Off
Off Off
Flash Fast On Off
Flash Slow Off On
On
On On
configuration and also when you load the application program
that controls the output.
Final Value
This field applies only to Mux output points. The final value
for the output is loaded to the Regent when the application
program that controls the output is delete
d. Unless special
circumstances exist, you should always choose Off, so that the
output is turned off when you delete the application program
that controls the output. If you do not enter a final value, the
output will remain in its last state when you delete the
application that controls it.
Programming
Mux input points are used in application programs just like
any other simplex input. Contacts in ladder logic can be used
to examine the on or off status of the inputs.
Mux outputs have special programming considerations. The
Mux outputs can be programmed to any one of four possible
states: On, Off, Flash slow, and Flash fast. In order to control
the outputs in these four states a special Mux Coil instruction
is provided in ladder logic. This instruction is used along with
the standard coil instruction to control the Mux output. Table
2
illustrates which on/off combinations of the Coil and Mux
Coil instructions produce the four output states.
16
Table 2. Programmi
ng Mux Output States
Industrial Control Services
Multiplexed I/O Module (T3491)
Maintenance
No periodic maintenance or calibration is required for the
multiplexed I/O module. There are no user replaceable parts
inside the module.
Troubleshooting
Most problems with the Mux I/O equipment relates to
improper configuration. For correct operation you should
carefully check the protocol configuration (single vs. dual) and
the MIU processor addresses. Verify the configuration
information with the link settings for the MIU processors.
Also you should carefully check the serial cable connections.
The Mux I/O module labels the serial cable connections with
‘A’ and ‘B’ designations although the MIU processors refer to
the connections as ‘+’ and ‘-’. The serial cable connection
diagram in Figure 4 properly illustrates the relationship
between these signal references.
Safety Considerations
The Multiplexed I/O module is TÜV certified as non
interfering and may be used for non-safety critical inputs and
outputs.
While the use of dual protocol configurations for 2oo2 voting
provides greater security for the communications link, it is not
sufficient to meet the requirements for Risk Class 5 safety
critical inputs and outputs. In applications of Mux I/O
equipment for maintenance override of safety critical inputs,
redundant Mux I/O Modules and MIU equipment is
recommended.
For additional safety considerations, please
Considerations section of the Regent User’s Guide.
-
refer to the Safety
PD-6035
Mar-06
17
Multiplexed I/O Module (T3491)
Safetybus Power
1.0 load units
Mux I/O Capacity
Maximum 12 MIU
processors supporting a total
of 8 Mux Input Units (512
points) and 4 Mux Output
Units (256 points).
Compatible MIU Equipment
MIU 3201
: Multiplexed I/O
Processor Unit,
MIU 3202
: Multiplexed
Input Unit, 64-channel,
MIU 3204
: Multiplexed
Output Unit, 64-channel
Port Type
Two isolated RS-422 ports
Protocol
Subset of ICS2000 I/O
communications protocol
Operat
ing Modes
Two independent single
communications links, or
Dual voted communications
links (2oo2)
Baud Rate
9,600 or 19,200 baud
Maximum Distance
approximately 4000 feet
(1220 m) @ 19,200 baud,
8000 feet (2440 m) @ 9,600
baud
Isolation
1,000 volts minimum (serial
port to serial port)
1,000 volts minimum (serial
port to logic)
Heat Dissipation
4.5 Watts, 15 BTUs/hour
Operating Temperature
0°
to 60° C
(32° to 140° F)
Storage Temperature
-40°
to 85° C
(-40°
to 185° F)
Specifications
18
Industrial Control Services
Multiplexed I/O Module (T3491)
Operating Humidity
0 to 95% relative humidity,
non-condensing
Vibration
10 to 55 Hz:
±0.15mm
Shock
Operating:
15 g, ½ sine wave, 11 msec
Electromagnetic
Interference
•
IEC 801 Part 2 - Electrostatic
Discharges
•
IEC 801 Part 3 - Radiated
Electromagnetic Fields
•
IEC 801 Part 4 - Transients
and Bursts
•
ANSI/IEEE C37.90 - Surge
Withstand Capability
Level 3: Contact discharge of
6 kV
Level 3: 10 V/M, 27 MHz 500 MHz
Level 4: 2 kV, 2.5 kHz for t =
60 seconds
2.5 kV damped 1 MHz sine
wave
4 kV bi-directional impulse,
10 nsec rise time, fast
transient
Safety
Certified to DIN V VDE
0801 for Risk Class 5, non
interfering. Also designed to
meet UL 508 and CSA 22.2,
No. 142-M1981
Dimensions
Height:
Width:
Depth:
12.6" (320 mm)
1.27" (32 mm)
10.12" (257 mm)
Weight
3.0 lbs (1.4 kg)
PD-6035
Mar-06
19
Loading...