Siemens TIWAY 1 User Manual
SIMA
TIC TIWAY 1
UNILINK Host Adapter
User
Manual
Order Number: PPX:TIWAY–8121–2
Manual Assembly Number: 2587871–0045
Second Edition
CHAPTER 1
THE
UNILINK HOST ADAPTER
1.1 INTRODUCTION
The
UNILINK Host Adapter
interface
devices
the “adapter” in this manual, is a hardware and software extension of the
original
product that allows a host computer to operate and control secondary
on a TIWAY I network. The UNILINK Host Adapter
TIWAY I Host Adapter
, Figure
.
1–1 is a second generation host computer
, also referred to as
Figure 1–1 UNILINK Host Adapter
UNILINK HOST
USER MANUAL
ADAPTER1–1
THE UNILINK HOST ADAPTER
1.2 FEATURES
The
hardware is composed of the UNILINK Adapter, shown in Figure 1–1, with
a
plug-in Personality Interface Module (PIM) PPX:500–6224.
in Figure 1–2, contains the software that causes the UNILINK Adapter to
operate
as the UNILINK Host Adapter
.
Figure 1–2 Personality Interface Module (PIM)
The PIM, shown
Figure 1–3 illustrates the basic structure of the UNILINK Host Adapter. The
corresponding physical features are shown in Figure 1–4. It includes an
RS–232–C/RS–423–A compatible host port that supports the Non-Intelligent
Terminal Protocol (NITP) used by the original TIWAY I Host Adapter, or the
BDLC
protocol, an advanced, byte-oriented subset of the HDLC protocol. Also,
there are two TIWAY I interface ports and an external I/O point block.
UNILINK HOST
USER MANUAL
ADAPTER 1–2
THE UNILINK HOST ADAPTER
Host
Computer
RS–232–C/RS–423A
Interface
Host
(Command Processor)
TIWA
Y I
Interface
TIWA
Y I
Input Point
External
Output Point
Network
Secondaries
Figure 1–3 UNILINK Host Adapter Block Diagram
UniLink
Host Adapter
Host
PPX:500–711
Computer Port
TIWA
Port
1
Y I Ports
Port
2
Port
1, Dual Local Line media ports shown here.
3
Power Connections
Port
4
External I/O Points
Figure 1–4 UNILINK Host Adapter Physical Features
AC
GND
NEUTACLINE
1
2 3 4 5
I/O
UNILINK HOST
USER MANUAL
ADAPTER1–3
THE UNILINK HOST ADAPTER
The
features of the UNILINK Host Adapter include:
The adapter is noise hardened for factory floor use.
There are internal diagnostics tests to check the internal operation
when
powered-up or reset, and during normal operation. There is also a
selectable
The adapter can be reset locally with an internal switch or remotely
with
test mode that is set locally
a host issued command.
.
The
The adapter is backward compatible with TIWAY I Host Adapter
The adapter includes an independent host communications port
This
The
The
The
adapter supports secondary-to-secondary communications without
complex
software
capable of serial communications at 38.4K baud. This port operates
simultaneously
throughput and data integrity. This protocol also allows up to 32
UNILINK Host Adapters to be multidropped (via a modem) from the
same
The adapter supports or provides the following TIWAY I features.
fault
devices
computer
another request when using the advanced host communication
protocol.
host software or additional hardware.
and drivers.
with the network ports.
host port provides an optional advanced host protocol for improved
host computer RS–232–C/RS–423–A port.
adapter supports the TIWAY I redundant media feature, providing
tolerant communications in case of a media failure.
adapter supports communication with multiple network secondary
concurrently for higher network throughput.
adapter supports concurrent network request processing. The host
does not have to wait
for a request to complete before issuing
UNILINK HOST
USER MANUAL
Commands are provided for background data collection. The adapter
can be configured to collect data for the host computer by storing the
most current data values in internal memory. Another command then
retrieves
ADAPTER 1–4
the data.
THE UNILINK HOST ADAPTER
The adapter is configurable for a variety of applications needs and
includes multiple host computer support, allowing several host
computers to communicate with the secondary devices on the same
T I WAY
The adapter provides transaction statistics collection to aid network
performance
1.3 TYPICAL NETWORK APPLICATIONS
I network.
tuning.
Figure
1–5 illustrates
a typical single host network managing a process control
application. The host computer application directs the secondary devices
through
the UNILINK Host Adapter and the TIWAY I network. Commands are
provided for downloading or uploading data from the host computer to the
secondary
devices and for checking the status of an individual device.
Host
Computer
RS–232–C/RS–423–A
Host Interface Cable
UNILINK
TIWAY
I
UniLink Host Adapter ( MHU)
Figure 1–5 Single Host Network
UNILINK HOST
USER MANUAL
ADAPTER1–5
THE UNILINK HOST ADAPTER
The
flexibility of the UNILINK Host Adapter also provides for
illustrated in Figure 1–6. In addition to the process control application, your
main plant system can link to the same network to track work-in-progress,
adjust
schedule loads for peak efficiency, and collect product cost data. W
additional UNILINK Host Adapter, you can also add a personal computer
workstation
to the network for statistical quality control or other uses.
multiple hosts as
ith an
Host
Computer
UniLink
Adapter (MHU)
Host
Computer
UNILINK
UniLink Host
Adapter (MHU)
Figure 1–6 Multiple Host Network
Host
UNILINK
UNILINK HOST
USER MANUAL
ADAPTER 1–6
THE UNILINK HOST ADAPTER
1.4 TIWA
Y I SYSTEM CHARACTERISTICS
TIWAY I is a bus structure Local Area Network (LAN) designed for industrial
environments. The TIWAY I network connects a series of Texas Instruments
Programmable Controllers (P/Cs) and other devices to one or more host
computers. W
any
of the following Siemens products:
SIMATICTI520/SIMATICTI530/
SIMATICTI560/SIMATICTI565 P/Cs
IT–111, IT–121, IT–121A, IT150, and IT–160 Intelligent Tank
The P/Cs are connected to a TIWAY I network through Network Interface
Modules (NIMs). The PM550 P/C can also be connected with a Computer
Interface Module (CIM), but
Secondary
as
the following, to be connected to a TIWAY I network.
ith the network, you can obtain, modify or replace data stored in
SIMATICTI520C/SIMATICTI530C P/Cs
PM550/PM550C P/Cs
5TI, Series 102, 103 P/Cs
Transmitters
Adapter is a
(ITT
s)
it limits the configuration choices. The UNILINK
TIWAY I interface device that allows other devices, such
Robots
Computer numerical controlled machines
Non-SIMA
Intelligent instruments
Computer equipment
TIWAY I gateways are also available for connecting the Fisher, Foxboro, and
Honeywell networks to TIWAY I. However, you cannot use a gateway and a
UNILINK
satisfy today’s factory requirements for acquiring data and controlling
manufacturing
network that uses an advanced data link protocol.
Series 500 controllers can be connected with PEERLINK for high speed
transfer of small amounts of data between controllers. The PEERLINK is a
solution for applications where one or more Series 500 controllers are
dependent
Host Adapter in the same TIWAY I network. TIWAY I
on high speed transfer of data from another Series 500 controller
TIC programmable controllers
processes.
It is a noise-hardened serial binary communications
is designed to
.
UNILINK HOST
USER MANUAL
ADAPTER1–7
THE UNILINK HOST ADAPTER
With
appropriate host software, an operator can program, monitor
any P/C or other intelligent device on the TIWAY I network from a single
location.
The importance of the UNILINK Host Adapter is that it provides a
communication link between the TIWAY I network and one or more host
computers. Figure 1–7 is a diagram representing the various host computers
that
can be connected to a UNILINK Host Adapter
can
be controlled in a TIWAY I network.
IBM
DEC
Y
ICC 6000
CVU
5000
TIPC
DEC
PDP–
11
/
X
S
E
R
T
E
S
1
, and the typical devices that
Other
M
IBM
PC/
XT/
AT
I
PC/
H
XT/
I
S
/
M
I
C
R
AT
O
S
, and control
NIM
5TI
UniLink
Host
Adapter
Honeywell
Fisher
Gateways
Y I
TIWA
Secondary
Adapter
NIM
SIMATIC
TI520
PEERLINK
NIM
PM550
NIM
SIMATIC
TI560
PEERLINK PEERLINK PEERLINK
NIM
SIMATIC
TI565
NIM
SIMATIC
TI530/
TI530C
NIM
Int.
Tank
Xmtr.
Robots
CNC
Int. Scales
Figure 1–7 TIWAY I Network
You cannot use a UNILINK Host Adapter in a TIWAY I network that also
contains
Host Adapter. Chapter 4 provides information on interfacing the adapter to a
TIWAY
a TIWAY I Gateway or Network Control Module (NCM) or a TIWAY I
I network.
Map
Foxboro
Other
Int. Devices
Others
UNILINK HOST
USER MANUAL
ADAPTER 1–8
THE UNILINK HOST ADAPTER
1.5 INSTALLATION
Instructions for installing the UNILINK Adapter and the UNILINK Host
Adapter PIM are given in the UNILINK Adapter Installation and Operation
Manual (PPX:TIWAY–8106). It provides the electrical and mechanical
installation
Chapter 2 discusses the different operational modes and how they are
configured.
instructions and guidelines for the the UNILINK Host Adapter
.
Chapter
dipswitches
Chapter
your
1.6 TECHNICAL
If you need assistance with the installation an operation of this equipment,
contact
you
States,
1.7 CUSTOMER
If you need assistance in placing an order, returning a product, or learning
about product availability, contact your Siemens Industrial Automation, Inc.
distributor
or
3 discusses the host computer interface port, Port 3, and how to set the
to establish communications.
4 discusses the TIWAY I interface ports, Ports 1 and 2, and how setup
network.
ASSIST
your Siemens Industrial Automation, Inc. distributor or sales agent. If
need assistance in contacting your distributor or sales office in the United
call 800–964–41
SER
or sales agent. If you need
sales office in the United States, call 800–964–41
ANCE
14.
VICE CENTER
assistance in contacting your distributor
14.
UNILINK HOST
USER MANUAL
ADAPTER1–9
CHAPTER
2
OPERA
TION AND APPLICA
2.1 INTRODUCTION
This
chapter provides an introduction to the UNILINK Host Adapter operation
and how it can be used in typical applications. Y
the
complete command syntax and to the Glossary for help with any unfamiliar
terms. Network planning forms are located in Appendix E, Appendix F, and
Appendix
G.
ou should refer to Chapter 5 for
2.2 COMMAND PROCESSING
The
UNILINK Host Adapter commands are a set of functional tools to help you
direct network applications. Each command consists of a one-byte command
code and one or more parameters as shown in Figure 2–1. Most parameters
have
default values that
network
you can improve
network needs. Figure 2–2 illustrates the relative performance and flexibility
gained
and expand it with minimal software changes. As your network grows,
network efficiency by redefining the parameters to match your
with using additional commands.
were selected to help you quickly install an operational
TION
Command
Code
Parameter#1Parameter
#2
Figure 2–1 Command String Structure
Parameter
#n
UNILINK HOST
USER MANUAL
ADAPTER2–1
OPERATION
AND
APPLICATION
Network
Manager
Commands
Performance
and
Applications
Flexibility
Mode Independent
Commands
Basic HIU
Commands
Extended HIU
Commands
Configure Adapter
Commands
NUMBER OF COMMANDS
Figure 2–2 Performance vs Commands
Communications between the host computer and the UNILINK Host Adapter
are
a series of commands and responses as illustrated in Figure 2–3. For every
command sent, there will be a response. The response will be one of the
following.
UNILINK HOST
USER MANUAL
An
ADAPTER 2–2
acknowledgment that the command was received
A command response
The ERROR RESPONSE
OPERATION
AND
APPLICATION
Secondary
Secondary
Host
Computer
Commands
UNILINK
Host Adapter
Responses
Figure 2–3 Host Computer To UNILINK Host Adapter
Communications
Commands are checked for errors before they are executed. The ERROR
RESPONSE is a special response that returns a code indicating the type of
error. If an error is found, the command will not be executed and the ERROR
RESPONSE
network request does not complete within the host command timeout. The
possible error codes that may be returned in the ERROR RESPONSE and
corrective
will
be returned. The ERROR RESPONSE will also be returned if a
actions to take are listed in Chapter 6.
UNILINK HOST
USER MANUAL
ADAPTER2–3
OPERATION
AND
APPLICATION
2.3 FUNCTIONAL ORGANIZATION AND OPERATING MODES
The
UNILINK Host Adapter is organized into two primary functions; the Host
Interface Unit (HIU) function and the Network Manager (NM) function. An
adapter
form
of
In addition to the above modes, there are two Emulate Host Adapter (EHA)
modes
can be configured with one
a Master Host Interface Unit (MHIU). The MHIU, HIU, and NM are three
the six configurable operating modes.
and a Standalone Network Manager (SANM) mode.
of these functions or they can be combined to
2.3.1
Host Inter
The primary purpose of the Host Interface Unit (HIU) function is to establish
communications between the host computer and the secondary devices on a
TIWAY I network. The HIU uses the memory in the adapter for macro buffers
and
are
used to store
connecting,
delays
Commands
the host requests are processed and queued to the Network Manager function
for
routing to the appropriate secondary device. The Master Host Interface Unit
(MHIU)
face Unit Function
to store host-to-secondary statistics as shown in Figure
macro commands and responses. Macros provide a method for
disconnecting, or sending a Primitive
in host processing. Macros are discussed further in Paragraph 2.10.1.
are received from the host computer and checked for validity
mode combines the HIU function and the Network Manager function.
to a secondary device without
2–4. Macro buffers
. Then
UNILINK HOST
USER MANUAL
ADAPTER 2–4
OPERATION
AND
APPLICATION
HIU
Establishes communications
between the host computer
and the secondary devices.
Uses memory for:
Macro Buffers
(Dynamically allocated)
Host–to–Secondary Statistics
Figure 2–4 Host Interface Unit Function
Part
of the statistics
issued
to
connect and disconnect secondaries, the specified secondary address is
added
or deleted from the Secondary Log and a network request is queued into
the
Network Manager
memory area is used for a Secondary Log. As commands are
.
In the background, the adapter is continuously collecting statistics on the
number of commands processed, transactions completed on the network, and
other items. Commands to retrieve these statistics do not require network
transactions,
The following operating modes include the HIU function.
but return the information from the appropriate statistical area.
Master Host Interface Unit (MHIU)
Host Interface Unit (HIU)
Master Host Interface Unit/Emulate Host Adapter (MHIU/EHA)
Host Interface Unit/Emulate Host Adapter (HIU/EHA)
UNILINK HOST
USER MANUAL
ADAPTER2–5
OPERATION
AND
APPLICATION
2.3.2
Network Manager Function
Acting as the network primary, the Network Manager function is responsible
for
controlling the message traffic on the TIWAY I network as shown in Figure
2–5.
It
receives the requests from HIUs and stores them in a NM buffer
them
to the designated secondary devices, and returns the secondary response
to the HIU that issued the request. There can be only one adapter configured
the Network Manager function in any particular TIWAY I network.
with
This
function will only process Network Manager commands. These
control
and handle the background monitor and redundant media switching
operations. All network requests and responses are queued in the Network
Manager
the TIWAY I network operations, return network statistical information
buffers area.
, routes
commands
NM
Manages the message traffic on
the TIWAY I network.
Uses memory for:
Network Buffers
Network Stations
Figure 2–5 Network Manager Function
UNILINK HOST
USER MANUAL
ADAPTER 2–6
OPERATION
The following operational modes include the NM function. However, the
MHIU/EHA
mode does not provide access to the NM command set.
Master Host Interface Unit (MHIU)
Network Manager (NM)
Standalone Network Manager (SANM)
Master Host Interface Unit/Emulate Host Adapter (MHIU/EHA)
AND
APPLICATION
2.3.3
The Master Host Inter
The Master Host Interface Unit (MHIU) is a combination of the HIU and NM
functions
communicate with secondary devices through the HIU function and control
network
a
TIWAY I network may have the NM function.
as shown in Figure 2–6. A host computer connected to an MHIU
performance
face Unit Mode
through the NM function. Remember
can
, only one adapter in
HIU NM
MHIU
Figure 2–6 Master Host Interface Unit Diagram
UNILINK HOST
ADAPTER2–7
USER MANUAL
OPERATION
AND
APPLICATION
2.3.4 Typical
Both single and multiple host networks are supported by the UNILINK Host
Adapter. Figure 2–7 illustrates a typical single host network which uses an
MHIU
Network Applications
as the host interface and network manager
Host
Computer
UNILINK
UniLink Host Adapter ( MHU)
RS–232–C/RS–4
23–A
Host
Interface
Cable
TIWAY
.
I
Figure 2–7 Typical Single Host Network
Multiple
operating modes as illustrated in Figure 2–8 and Figure 2–9. Since the NM
function
and HIUs can use the total memory resources of the adapters for their
respective needs. This could be an advantage in large networks where the
additional
host
networks can be configured with a variety of adapters in different
is not in the same adapter with the HIU function in Figure 2–9, the NM
memory for NM buffers will increase network performance.
UNILINK HOST
USER MANUAL
ADAPTER 2–8
OPERATION
AND
APPLICATION
Host
Computer
UniLink Host
Adapter (MHU)
Figure 2–8 Typical Multiple Host Network
UNILINK
Host
Computer
UNILINK
UniLink Host
Adapter (MHU)
Host
Com-
puter
Host
Computer
UNILINK
(HIU)
UNILINK
Figure 2–9 NM Network
Host
Computer
UNILINK
(HIU)
UNILINK HOST
USER MANUAL
ADAPTER2–9
OPERATION
AND
APPLICATION
2.3.5 The
There are two modes available that provide an emulation of the TIWAY I Host
Adapter; the MHIU/EHA and the HIU/EHA. These modes are limited to the
base command codes 01 through 08, 20, 21, and FC through FF. The POLL
command,
will operate with applications software written for the TIWAY I Host Adapter.
The MHIU/EHA can directly replace the TIWAY I Host Adapter in single host
network applications. However, the MHIU/EHA cannot be used in a multiple
host
software
2.3.6
The Standalone Network Manager Mode
The Standalone Network Manager mode operates independent of any host
computer. It controls the TIWAY I network, but cannot accept any host
commands to change any performance parameters. You can use this mode to
implement
TIWAY I Host Adapter. Only minor changes to the applications software are
needed to process the adapter configuration command. A typical network is
shown
Emulate Host Adapter Modes
code 03, is not available in the HIU/EHA mode. Both of these modes
network. The HIU/EHA provides the ability to use TIWAY I Host Adapter
applications in a multiple host network.
a multiple host network using applications software written for the
in Figure 2–10.
UNILINK
(SANM)
Host
Computer
UNILINK
(HIU)
Host
Computer
(HIU)
Figure 2–10 Standalone NM Network
2.4 TIWAY I HOST SOFTWARE SUPPORT
As mentioned in Paragraph 2.3.5, the MHIU/EHA and HIU/EHA modes will
operate with the TIWAY I HOST SOFTWARE products. The MHIU and NM
modes
will also work with this product; however
and
NM commands in the XP
AR subroutine.
, you must enclose the extended
UNILINK
UNILINK HOST
USER MANUAL
ADAPTER 2–10
OPERATION
AND
APPLICATION
TIWAY I Host Software can be used with adapters in a
However,
CONFIGURE
you must define an HIU address using the XP
HIU command, and you cannot use the POLL command.
multiple host network.
AR subroutine and the
UNILINK HOST
USER MANUAL
ADAPTER2–11
OPERATION
AND
APPLICATION
2.5 SETTING THE OPERATING MODE
Each adapter must be configured for one of the six possible operating modes.
The mode is configured with the CONFIGURE ADAPTER command with the
exception of the Standalone NM mode, which is chosen by setting Positions 9
and
10
of Dipswitch 1 down. The defaults and dipswitch settings are discussed
further in Paragraph 2.5.1. There are three configuration commands; the
CONFIGURE
CONFIGURE
ADAPTER command, the
NM command.
CONFIGURE HIU command, and the
2.5.1
Configuration Defaults and Dipswitch Settings
Most of the parameters associated with the configuration commands have
default values chosen to help you install an operating host interface with a
minimum amount of effort. As your network expands and you gain experience
with
the advanced commands, you can change the defaults to tailor the network
performance
The adapter has two 10-position dipswitch banks, located behind the front
access door as shown in Figure 2–11. Most of the settings on the dipswitches
relate
to the parameters for the host and TIWAY I ports. However
Position
up, the adapter will default to an HIU/EHA and when Position 9 is down, the
adapter
to your needs.
, the setting of
9 on Dipswitch 2 determines the default mode value. When Position 9 is
will default to an MHIU/EHA.
Number 1
2
LEDsResetNumber
2.5.2
UNILINK HOST
USER MANUAL
Figure 2–11 Dipswitch Positions
The
default mode will be chosen when you issue one
before issuing the CONFIGURE ADAPTER command. In the later case, the
adapter
and
issue
or
The CONFIGURE ADAPTER Command
The first command your application software should send is the CONFIGURE
ADAPTER
ADAPTER 2–12
assumes the
assumes the EHA mode. This means that after the adapter is reset, if you
any of commands 01 through 08, the adapter will assume the MHIU/EHA
HIU/EHA mode depending on the setting of Position 9.
command, code 20. The main function of this command is to set the
default mode from the setting of Position 9 on Dipswitch 2
of the Base HIU commands
OPERATION
AND
APPLICATION
operating
set with this command is the Standalone Network Manager (SANM), since it
can not accept any host computer commands. Instead, the SANM mode is
selected
computer must send this command to its attached UNILINK Host Adapter(s).
The mode remains in effect and can not be changed until the adapter is reset.
The parameters for this command specify the HIU address, the maximum
secondary
mode to the value specified. The only operating mode that can not be
by
dipswitch settings described in Chapter 3 and Chapter 4. Each host
device address, and the macro memory limit.
UNILINK HOST
USER MANUAL
ADAPTER2–13
OPERATION
At
any
time, your applications software can retrieve the current values for these
parameters
code 21. In addition to those parameter values, this command will also return
the values of the dipswitch settings and a flag that indicates whether the
CONFIGURE
The physical network parameters for the HIU function of an MHIU are not
used, but the CONFIGURE ADAPTER command must still be sent to enable
the
HIUs network interface.
by issuing the REPORT ADAPTER CONFIGURA
ADAPTER command was previously processed.
AND
APPLICATION
TION command,
2.5.3
2.5.4
The CONFIGURE HIU Command
The CONFIGURE HIU command defines the network parameters for an HIU
function and enables the HIUs TIWAY I interface for both an MHIU and an
HIU.
The options and associated parameters can occur in the command string
in
any
order
, but they can not occur twice in the same command. This command
can only be issued once and if successful, the command code, 11, will be
returned.
The REPORT HIU CONFIGURATION command, code 12, will return the
values of the dipswitches, HIU Options, and a flag indicating whether the
configuration
The CONFIGURE NETWORK MANAGER Command
The CONFIGURE NETWORK MANAGER command, code 30, defines the
operating parameters for the network ports in the NM and MHIU modes and
specifies
Issue the REPORT NETWORK MANAGER CONFIGURATION command,
code 31, to retrieve the dipswitch settings and the current values for the
Network Manager parameters and to determine if the CONFIGURE
NETWORK MANAGER command has been processed. In a multiprocessing
environment,
whether
has been performed.
network options such as auto redundant media.
the tasks can check the configuration processed flag to determine
or not they can begin issuing commands to the adapter
.
UNILINK HOST
USER MANUAL
ADAPTER 2–14
OPERATION
AND
APPLICATION
2.5.5
Configuring the Standalone Network Manager
The
Standalone Network Manager (SANM)
dipswitch
settings. The
definition for some of the dipswitch positions is different
mode is configured completely with
for this operating mode as shown in Figure 2–12. The SANM mode is selected by
defining the host command timeout as zero by setting Positions 9 and 10 of
Dipswitch 1 down. The other positions of Dipswitch 1 define the TIWAY I
network
parameters.
DIPSWITCH 1
1
2345678910
U
P
MSB LSB
UP = SYNCHRONOUS
DOWN = ASYNCHRONOUS
UP = FULL DUPLEX
DOWN = HALF DUPLEX
UP = NRZI
DOWN = NRZ
DEFAULTS TO NITP
HOST COMMAND
TIMEOUT = 0
TIWAY I BAUD RATE
TIWAY I
TIWAY I
TIWAY I
DIPSWITCH 2
1
2345678910
U
P
UP = TEST MODE
DOWN = RUN MODE
MSB
LSB
UP = HIU/EHA &
DOWN = MHIU/EHA
UNUSED
UP = AUTO
DOWN = NO REDUNDĆ
HIU/NM BUFFERS
UP = DISC
DOWN = NO DISC
UP = AFTER CTS
DOWN = NO DELAY
IO LOOP TEST
REDUNDANT
MEDIA
ANT MEDIA
DELAY
Figure 2–12 Standalone Network Manager Dipswitch Settings
UNILINK HOST
USER MANUAL
ADAPTER2–15
OPERATION
Since
the SANM cannot accept any NM commands, Positions 1–7
define
certain Network Manager function options normally configured with the
CONFIGURE
NETWORK MANAGER command.
When
Position 1 of Dipswitch 2 is
after
CTS is active. No delay is selected when the dipswitch is down.
When
Position 2 of Dipswitch 2 is up, all
issue a network disconnect (DISC). This permission is granted by the
NM function when it initializes the HIU. No HIUs will be given
permission
to issue a DISC when the dipswitch is down.
AND
APPLICATION
of Dipswitch 2
up, it selects a one-half second delay
HIUs are given permission to
2.5.6
Positions
of NM buffers to assign to an HIU when the HIU is initialized. The
number
selected
significant bit and Position 6 is the least significant bit. The adapter will
then
When Position 7 of Dipswitch 2 is up, the NM function will use the
redundant
communicate
Configuration Summary
The general procedure for configuring the adapter follows in the list below
1.
Set the dipswitch positions.
2.
Issue the CONFIGURE ADAPTER command.
3. Issue
or
a NM)
4. Issue the CONFIGURE HIU command. (If this adapter will be an
MHIU
3–6 of Dipswitch
of NM buffers can range from 1 to 16. The actual binary value
will range from 0000 to 1111 binary where Position 3 is the most
add 1 to the binary value to scale the actual range to 1–16.
media feature that uses both network ports, Ports 1 and 2, to
with the secondary devices.
the CONFIGURE NM command. (If this adapter will be an
or an HIU)
2 represent the binary value for the number
MHIU
.
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USER MANUAL
ADAPTER 2–16
OPERATION
AND
APPLICATION
2.6 SPECIAL NETWORK MANAGER FEATURES
The adapter provides two special features in the MHIU and NM operating
modes.
channel switching. Second is the background monitor that will bring devices
online
First is the redundant media channels with selectable automatic media
dynamically
.
2.6.1
Redundant Media Channels
The
adapter provides for two network media channels, Ports 1 and 2, described
in
more detail in Chapter 4 . Y
specifying the
command. Using redundant media increases the mission reliability of the
network or the probability that the network will remain operational when a
random
Channel A or Port 1. Your applications software can then issue the SWITCH
CHANNEL command at any time to change the operating channel for one,
several,
redundant media feature is not active; however, if it is active, the Network
Manager
Port
2 must be available or an ERROR RESPONSE will be returned when you
try to issue this command.
the
command code and the channel code.
The primary function of redundant media is to provide a second
communications
be used as a maintenance aid by switching all secondaries to the alternate
channel so that the main channel can be maintained without completely
shutting the network down. Remember, only one media or channel can be
transmitting
appropriate value in the CONFIGURE NETWORK MANAGER
failure occurs. When first initialized, the adapter
or all secondary devices. The channel can be switched even if the
function will switch the channel back if a failure occurs. Channel B or
path in the event of a failure on the primary path. This can also
or receiving in a given instance.
ou may select to use only one channel or both by
will communicate on
auto
If the command is accepted, the adapter will return
The auto redundant media feature allows the Network Manager function to
automatically switch a secondary device to the opposite channel if
communications
device will be switched if it fails to respond consecutively in
maximum-retry-count times. The maximum retry count is specified in the
CONFIGURE
the secondary has been switched, the Network Manager function will attempt
to
communicate again on the new channel up
secondary responds, communications will continue on this channel. If the
secondary fails to respond, the secondary will be logged as off-line and all
associated macros will be disabled. All macro response status words will be
updated to indicate that the secondary is off-line, and any network requests
that
were pending will return the ERROR RESPONSE.
2.6.2 Backgr
Background monitor is a feature of the Network Manager that instructs it to
periodically check the link status of each secondary device. This feature is
active in the Network Manager function in all but the EHA modes and the
SANM mode. The link status information includes
for each channel and for each secondary, whether the secondary is online or
can no longer continue on the current channel. The
NETWORK MANAGER command and defaults to 3 times. Once
to the maximum retry count. If the
ound Monitor
the communications status
UNILINK HOST
secondary
ADAPTER2–17
USER MANUAL
OPERATION
AND
APPLICATION
offline,
through
directives or responses. In addition, it will also select one secondary device
address
initially begins with secondary number one and continues with the next
secondary address number until reaching the maximum secondary address
specified in the CONFIGURE ADAPTER command. Background monitoring
then
The current link status determines what action to take when monitoring a
device. If the current link status for the selected secondary address is offline,
the Network Manager will issue the initialization sequence. If there is no
response, the Network Manager will assume that the device is not in the
network and will not retry the message. If the device does respond, its status
will
time
online.
and if the secondary is an HIU. The Network Manager normally cycles
the secondary device log and checks to see if there are any outstanding
per cycle to perform a
starts over again with address one.
be updated and if it is an HIU, buffers will be allocated. This means that any
that a valid secondary device is connected to the
link status check. The selected secondary address
network, it will be brought
UNILINK HOST
USER MANUAL
ADAPTER 2–18
OPERATION
If the background monitor detects a secondary that went offline and the auto
redundant media feature is active, the Network Manager will attempt to
contact the secondary on the alternate channel as described in the Redundant
Media
section above.
You can obtain peak performance by consecutively numbering your secondary
devices and HIUs, starting with address 01, and by setting the largest
secondary
will keep the Network Manager from spending time on device addresses that
will
status
code
device address value in
never exist on
information with the REPORT SECONDARY LINK STATUS command,
32.
the network. Y
AND
APPLICATION
the CONFIGURE ADAPTER command. This
our applications software can request the link
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USER MANUAL
ADAPTER2–19
OPERATION
AND
APPLICATION
2.7 THE HIU AS A SECONDARY
The
HIU function appears as a special secondary device to the NM function. In
addition to queuing network requests for the NM function to process, the HIU
function will respond to TIWAY I Primitives 02 — Machine Status, 03 —
Machine Type/Configuration, and 04 — Primitive Format Configuration. The
TIWAY I Systems Manual provides more details on the format and use of
Primitives.
2.7.1 Primitive
The Primitive 02 response will be returned as follows (spaces were added for
clarity).
Where
Status is not available,
02 Response
LLLL
02 HH DD EE FF
LLLL is the Primitive length,
HH will be 00 indicating that it is operational and
performing instruction execution,
DD will be 01 indicating that the Auxiliary Power Source
EE will be 00 indicating that the NIM is operational,
FF will be 00 and has no meaning for an HIU.
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USER MANUAL
ADAPTER 2–20
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