Yokogawa EJA115 - Manual (Page 26)

IM 01C22T02-01E 5-4
5. CONFIGURATION
5.5 Communication Setting
To set the communication function, it is necessary to
change the database residing in System/network
Management VFD.
5.5.1 VCR Setting
Set VCR (Virtual Communication Relationship), which
specifies the called party for communication and
resources. EJA has 17 VCRs whose application can be
changed, except for the first VCR, which is used for
management.
EJA has VCRs of four types:
Server(QUB) VCR
A Server responds to requests from a host. This
communication needs data exchange. This type of
communication is called QUB (Queued User-
triggered Bidirectional) VCR.
Source (QUU) VCR
A Source multicasts alarms or trends to other
devices. This type of communication is called QUU
(Queued User-triggered Unidirectional) VCR.
Publisher (BNU) VCR
A Publisher multicasts AI block output to another
function block(s). This type of communication is
called BNU (Buffered Network-triggered Unidirec-
tional) VCR.
Subscriber (BNU) VCR
A Subscriber receives output of another function
block(s) by PID block.
A Server VCR is capable to responding to requests
from a Client (QUB) VCR after the Client successfully
initiates connection to the Server. A Source VCR
transmits data without established connection. A Sink
(QUU) VCR on another device can receive it if the
Sink is configured so. A Publisher VCR transmits data
when LAS requests so. An explicit connection is
established from Subscriber (BNU) VCR(s) so that a
Subscriber knows the format of published data.
Each VCR has the parameters listed in Table 5.4.
Parameters must be changed together for each VCR
because modification for each parameter may cause
inconsistent operation.
Table 5.4 VCR Static Entry
T0504-1.EPS
Sub-
index
Parameter Description
1 FasArTypeAndRole Indicates the type and role of
communication (VCR). The
following 4 types are used
for EJA.
0x32: Server (Responds to
requests from host.)
0x44: Source (Transmits
alarm or trend.)
0x66: Publisher (Sends AI
block output to other
blocks.)
0x76: Subscriber (Receives
output of other blocks
by PID block.)
2 FasDllLocalAddr Sets the local address to
specify VCR in EJA. A range
of 20 to F7 in hexadecimal.
3 FasDllConfigured
RemoteAddr Sets the node address of the
called party for
communication and the
address (DLSAP or DLCEP)
used to specify VCR in that
address. For DLSAP or
DLCEP, a range of 20 to F7
in hexadecimal is used.
Addresses in Subindex 2
and 3 need to be set to the
same contents of the VCR
as the called party (local and
remote are reversed).
4 FasDllSDAP Specifies the quality of
communication. Usually, one
of the following types is set.
0x2B: Server
0x01: Source (Alert)
0x03: Source (Trend)
0x91: Publisher/Subscriber
5 FasDllMaxConfirm
DelayOnConnect To establish connection for
communication, a maximum
wait time for the called
party's response is set in
ms. Typical value is 60
secounds (60000).
6 FasDllMaxConfirm
DelayOnData For request of data, a
maximum wait time for the
called party's response is
set in ms. Typical value is
60 secounds (60000).
7 FasDllMaxDlsduSize Specifies maximum DL
Service Data unit Size
(DLSDU). Set 256 for Server
and Trend VCR, and 64 for
other VCRs.
8 FasDllResidual
ActivitySupported Specifies whether
connection is monitored. Set
TRUE (0xff) for Server. This
parameter is not used for
other communication.
9 FasDllTimelinessClass Not used for EJA.
10 FasDllPublisherTime
WindowSize Not used for EJA.
11 FasDllPublisher
SynchronizaingDlcep Not used for EJA.