BEKA BA684D User manual

Issue: 6
5th May 2021
BA684D
Field mounting
Modbus RTU display
Serial Data display
Issue 6

. Description
1.1 Documentation
1.2 Version 3.4 firmware
2. Operation
3. Applications
3.1 Legacy protoco
3.2 Modbus protoco
3.3 BEKA protoco
4. System Design
4.1 Power supp y
4.2 Communication
4.3 Switch outputs
4.4 Externa switches
5. Installation
5.1 Location
5.2 Insta ation procedure
5.3 EMC
6. Configuration
6.1 Defau t configuration
6.2 Accessing the configuration menus
6.3 Summary of configurab e functions
6.4 Quick access menu
7. Maintenance
7.1 Fau t finding during commissioning
7.2 Fau t finding after commissioning
7.3 Servicing
7.4 Routine maintenance
7.5 Guarantee
7.6 Customer comments
8. Accessories
8.1 Tag number
8.2 Pipe mounting kits
8.3 Seria Text Disp ay - Programming
Guide.
8.4 Seria Text Disp ay – Modbus
Guide
9. Index
Appendix
Getting Started Quick y
2
CONTENTS
The BA684D is CE marked to show comp iance with the
European EMC Directive 2004/108/EC

. DESCRIPTION
The BA684D is a 24V dc powered instrument
which can disp ay text and simp e graphics in a
process area. Incorporating a back it 120 x 64
pixe graphica disp ay, four operator switches and
two so id state outputs, it is a versati e operator
interface for simp e machine or process contro
app ications.
Housed in a robust IP66 g ass reinforced po yester
(GRP) enc osure with an armoured g ass window,
the BA684D is surface mounting, or may be pipe
mounted using one of the accessory kits.
The BA684D is avai ab e with an RS232 or with an
RS485 communication port.
. Documentation
This instruction manua describes system design,
conditioning and insta ation of the BA684D seria
text disp ay. If you wish to quick y insta and
commission a BA684D for a basic app ication,
p ease read Appendix 1 Getting Started Quick y.
For detai ed programming information separate
guides describe the Modbus and BEKA protoco s.
These are avai ab e from our sa es department or
may be down oaded from www.beka.co.uk.
Serial Text Display–Modbus Interface Guide
Description of parameters
Use with standard screens
Serial Text Display–Programming Guide
BEKA protoco
Command summary & reference
Scripting
Pattern matching
Advanced features
.2 Version 3.4 Firmware
This manua describes the additiona features
avai ab e in text disp ays emp oying version 3.4
firmware which was re eased in October 2009.
Name y:
Two eight variab e standard screens added.
Integer variab es added to the Modbus register
map to comp ement the origina f oat va ues.
New function a ows the number of process
variab es to be entered, so that when scro ing
the disp ay unused screens are not shown.
Enhancements to to the Scripting faci ity.
The instrument’s firmware version can be
estab ished using the ‘Unit Info’ function in the
main configuration menu - see section 6.3 of this
manua . Text disp ays emp oying Version 3.4
firmware are backwards compatib e with a ear ier
versions.
2. OPERATION
Fig 1 shows a simp ified b ock diagram of a
BA684D seria text disp ay. Two versions are
avai ab e, one has an RS232 port and the other an
RS485 port. The type of port is shown on the
abe fixed to the inside of the termina cover.
The two switch outputs may be contro ed and the
operator switches interrogated via the seria
communication ink.
Fig 1 Simp ified b ock diagram of BA684D
3. APPLICATIONS
The BA684D has been designed for easy
integration with most seria data sources and
therefore contains a wea th of features. A though
at first sight the comp exity may seem daunting,
the support documentation is app ication re ated so
that on y re evant sections need to be read. If
additiona he p is needed BEKA engineers are
a ways wi ing to assist with system design,
programming and screen deve opment.
The BA684D may be used with three a ternative
protoco s; Legacy, BEKA or Modbus RTU. The
pattern matching function a so enab es proprietary
ASCII seria data, such as that from a weighing
system, to be decoded and disp ayed. This
advanced feature is described in the Serial Text
Display - Programming Guide.
3

3. Legacy protocol
The Legacy protoco contained in the BA684D
a ows the instrument to rep ace an MTL643 IS text
disp ay for safe area (non hazardous) app ications.
The MTL643 uses proprietary two wire
communications generated by an MTL5051
ga vanic iso ator from an RS232 or RS422 safe
area port. A BA684D can therefore rep ace an
MTL643 disp ay for safe area app ications and
e iminate the need for an MTL5051 iso ator. The
BA684D rep icates a the functions of an MTL643
and has the advantage of a back it disp ay.
WARNING
The BA684D serial text display is not
intrinsically safe and must not be
installed in a hazardous area.
Legacy protoco on y a ows three externa
switches S1, S2 & S3, not the front pane push-
buttons, to be used for operator inputs. Simi ar y,
the MTL643 on y has one output contro , so the
two BA684D switch outputs operate in para e .
3.2 Modbus RTU protocol
The BA684D supports Modbus RTU protoco in
s ave mode. Up to eight process variab es,
together with their units of measurement and tag
descriptions may be disp ayed on one of the
e even standard screen formats shown be ow.
These i ustrate typica units of measurement and
tag information, but any may be entered. This
a ows one, two, four or eight process variab es to
be shown on a common screen without the need
for any programming, apart from setting the
BA684D address and writing each Modbus
variab e in the required Modbus register address
map.
If more process variab es than can be shown on
the se ected standard screen are to be disp ayed,
the operator can se ect which process variab es
are shown by operating the Up or Down push-
buttons. This se ection can a so be made by the
system host.
The Modbus protoco a so enab es each of the four
front pane push-buttons to be interrogated so they
may be used for operator contro s. If arger
industria size push-buttons are required, up to six
may be connected to the BA684D termina s.
When externa switches are used the instrument
front pane switches are disab ed.
The two sing e po e outputs may be independent y
contro ed for switching ow power oads such as a
sounder, beacon or va ve.
Modbus protoco is described in the Serial Text
Display – Modbus Guide, which is avai ab e from
the BEKA sa es office and from the BEKA web site.
For more demanding app ications BEKA protoco
may be used to construct custom disp ay screens
for use in a Modbus system. See Serial Text
Display – Programming Guide which is avai ab e
from the BEKA sa es office and from the BEKA
web site.
One variable
Two variables
Four variables
Eight variables
One variable + horizontal bargraph
Two variables + horizontal bargraphs
4

One variable + vertical bargraph
Two variables + vertical bargraphs
Three variables + vertical bargraphs
Four variables + vertical bargraphs
Eight variables + horizontal bargraphs
3.3 BEKA protocol
BEKA protoco enab es text to be written anywhere
on the screen in five different font sizes, together
with ines, boxes and bargraphs. A ternative y one
of the nine standard disp ay screens described in
section 3.2 may be used.
Simp e bit map graphics may a so be down oaded
to the disp ay and a characters can be reversed or
f ashed. Information may a so be written to a
hidden screen that may be disp ayed when
required.
This protoco enab es each of the four front pane
push-buttons to be interrogated so they may be
used for operator contro s. By disp aying the
switch function on the screen above the button,
‘soft switches’ can be created. If arger industria
size push-buttons are required, these may be
connected to the BA684D termina s. When
externa switches are used the front pane switches
are disab ed.
The two sing e po e outputs may be independent y
contro ed for switching any sma oad such as
sounder, beacon or va ve.
BEKA protoco is described in the Serial Text
Display – Programming Guide which is avai ab e
from the BEKA sa es office and from the BEKA
web site.
5

4. SYSTEM DESIGN
Figure 1 shows a functiona b ock diagram of
BA684D seria text disp ay. Termina ocations are
shown in Fig 4.
4. Power supply
Any dc power supp y having an output between 20
and 36 vo ts that is capab e of supp ying 95mA
may be used to power the BA684D. The power
supp y output ripp e must not cause the
instantaneous vo tage to fa be ow 20V.
The BA684D does not have ga vanic iso ation
between the power supp y, externa switch and
seria communication termina s. If a common or
earthed supp y is used, the communication port
and the optiona externa switches shou d on y be
connected to e ectrica y iso ated circuits.
4.2 Communication
The BA684D seria text disp ay is avai ab e with
either an RS232 or an RS485 communication port.
This is a factory set option that can’t be changed
on site. The type of port is shown on the abe
fitted to the inside of the instrument termina cover.
Fig 2 shows connections for both types of port.
Fig 2 RS485 & RS232 port connections
4.3 Switch outputs
The BA684D seria text disp ay has two sing e po e
re ay outputs which may be used for switching
sma oads such as va ves, actuators and
sounders.
The output re ay contact rating must not be
exceeded.
240V 5A 1.25kVA
30V 5A 150W dc
When a reactive oad is being switched by the
re ay contact, it is essentia that a suppresser is
fitted to prevent contact damage and radio
frequency interference. A 0.1µF capacitor in series
with a 100 resistor connected between the re ay
contacts wi usua y provide adequate
suppression. Proprietary encapsu ated
suppression assemb ies can be purchased from
e ectrica supp iers. P ease note that BEKA
associates’ guarantee exc udes re ay contact
damage.
WARNING
These switch outputs should not be
used for critical safety applications.
When the BA684D power supp y is turned off or
disconnected, both switch outputs wi open.
4.4 External switches
For app ications requiring operator inputs to be
made by arge industria push-buttons, termina s
S1 to S7 a ow six externa switches to be
connected to the text disp ay. When the externa
push-buttons are enab ed in the configuration
menu, the front pane push-buttons are
automatica y disab ed for operator inputs, a though
they continue to function for instrument
configuration.
The externa switch termina s are not iso ated from
the BA684D power supp y and communication
termina s. Externa switches shou d therefore be
f oating, i.e. not earthed or connected to any other
circuits.
6

5. INSTALLATION
5. Location
The BA684D seria text disp ay is housed in a
robust IP66 g ass reinforced po yester (GRP)
enc osure incorporating armoured g ass window
and stain ess stee fittings. It is suitab e for exterior
mounting in most industria environments, inc uding
off-shore and waste water treatment insta ations.
P ease consu t BEKA associates if high vibration is
anticipated.
The BA684D enc osure is surface mounting.
Accessory kits described in sections 8.2 of this
manua enab e the instrument to be mounted onto
a vertica or horizonta pipe.
The fie d termina s and the two mounting ho es are
ocated in a separate compartment with a sea ed
cover a owing the instrument to be insta ed
without exposing the disp ay assemb y.
The BA684D earth termina is connected to the
interna EMC fi ters. For maximum radio frequency
interference rejection this termina shou d be
connected to a oca earth.
The BA684D enc osure is supp ied with a bonding
p ate to ensure e ectrica continuity between the
three conduit / cab e entries.
5.2 Installation Procedure
Fig 3 i ustrates the instrument insta ation
procedure.
a. Remove the instrument termina cover by
unscrewing the two captive 'A' screws.
b. Mount the instrument on a f at surface and
secure with two M6 screws through the 'B'
ho es. A ternative y use one of the mounting
kits described in section 8.2
c. Remove the temporary ho e p ug and insta
an appropriate IP rated cab e g and or
conduit fitting. If more than one entry is
required, one or both of the IP66 stopping
p ugs may be rep aced with an appropriate IP
rated cab e g and or conduit fitting.
d. Connect the fie d wiring to the termina s as
shown in Fig 4.
e. Rep ace the instrument termina cover and
even y tighten the two 'A' screws.
Fig 3 BA684D insta ation procedure
5.3 EMC
The BA684D comp ies with the requirements of the
European EMC Directive 2004/108/EC. For
specified immunity a wiring shou d be in screened
twisted pairs and one of the BA684D earth
termina s shou d be oca y earthed.
To prevent circu ating currents, cab e screens
shou d on y be earthed at one point.
7

Fig 4 Dimensions and termina connections
8

6. CONFIGURATION
Before the BA684D can be commissioned it must
be configured to be compatib e with the host’s
communications format and to have the required
functions enab ed.
The BA684D is configured via the four front pane
push-buttons. A the configuration functions are
contained in an easy to use menu shown in Fig 5.
Where necessary the sub-menus contain on-
screen prompts to guide the user through each
adjustment.
When navigating through the configuration menu,
the push-button(s) shou d be he d unti the required
screen is disp ayed.
6. Default configuration
Un ess otherwise requested at time of ordering,
BA684D text disp ays wi be supp ied configured
as fo ows:
Baud rate 9.6k
Data bits 8
Stop bit 1
Parity None
Protoco BEKA
Address 0
Operationa mode 1
Keypad Interna
Disp ay brightness 100%
Disp ay contrast 50%
Quick access menu On
Show Status Text On
Set Last Va id Input 8
Quick access menu code 0000
Configuration menu
access code. 0000
Key Mode 0
Screens Text Disp ay
6.2 Accessing the configuration menus
Throughout this manua push-buttons are shown in
ita ics e.g. P or Up push-button, and egends
disp ayed by the instrument are shown within
inverted commas e.g. 'P ease enter code'.
The configuration menu is accessed by operating
the P and E push-buttons simu taneous y. If the
BA684D is not protected by an access code the
main menu wi be disp ayed. If an access code
other than the defau t code 0000 has a ready been
entered, the BA684D wi request that the access
code be entered.
Using the Up or Down button set the first digit of
the code which wi be f ashing. Pressing P wi
transfer contro to the next digit which shou d be
adjusted in the same way. When a four digits
have been set, pressing the E button wi enter the
access code.
If the code is correct the main menu wi be
disp ayed, if the code is incorrect ‘Inva id code’ wi
be disp ayed.
When entering an access code, timeout wi occur
and the instrument wi automatica y return to the
operating mode ten seconds after the push-buttons
were ast operated. In a other menus timeout
occurs after thirty seconds.
When the main menu is disp ayed the required
sub-menu can be high ighted by scro ing through
the menu using the Up or Down push-button.
Operating the P push-button wi disp ay the
high ighted sub-menu from which a further
se ection may be made. After a configuration
parameter has been adjusted, pressing the E
button wi enter the se ection and move the disp ay
up one eve .
After the instrument configuration has been
comp eted, operating the E push-button repeated y
wi return the instrument disp ay to the main menu.
One more operation of the E button wi then return
the BA684D to the operating mode.
6.3 Summary of configurable functions
This section provides a brief exp anation of each
configurab e function and shou d be read in
conjunction with Fig 5.
View settings
Disp ays the instruments main communication
settings. Adjustments can not be made from
this sub-menu.
Baud rate
Range depends upon type of port. For RS485,
data rate may be set to one of ten speeds
between 0.3 and 115.2kbaud. For RS232,
data rate imited to one of seven rates between
0.3 and 19.2kbaud.
Data bits
7 or 8 data bits may be se ected. 8 bit data is
required in BEKA mode for graphics, for error
checked modes and for Modbus.
Stop bits
1 or 2 stop bits may be se ected
Parity
An even, odd or no parity bit may be se ected.
Protocol
BEKA, Legacy or Modbus protoco may be
se ected. The Legacy protoco is compatib e
with the MTL643.
9

Address
Each text disp ay must be a ocated a unique
address within the fo owing ranges:
Modbus protoco 1 – 247
BEKA protoco 0 – 247 Zero reserved for
Legacy protoco 0 –15 sing e unit app ications.
Op Mode
Five different eve s of communications security
to be se ected, ranging from immediate
execution of a command with no
acknow edgement, to a requirement for a 16 bit
cyc ic redundancy check. See the Serial Text
Display - Programming Guide for a detai ed
exp anation.
Not avai ab e with Legacy protoco .
Key mode
Key press data can be returned in three ways.
See Response Format Section in the Serial
Text Display - Programming Guide. Not
app icab e with Legacy protoco .
Keypad
This function a ows the instrument front pane
push-buttons or externa push-buttons to be
used for operator inputs. Whichever are
se ected, the instrument front pane push-
buttons are used for configuration.
This function is not avai ab e when Legacy
protoco is se ected.
Settings
A ows the back ight brightness and contrast of
the BA484D disp ay to be adjusted.
Screens
One of nine standard screens or a custom
screen may be se ected.
Not app icab e with Legacy protoco .
Quick access
This function enab es the quick access menu
described in section 7.4. When ‘On’ is se ected
an operator can adjust the screen bri iance and
contrast without having access to other
conditioning parameters.
Access code for the Quick Access Menu
‘Access Code’ in the disp ay menu defines the
four digit a phanumeric code that must be
entered to gain access to the instrument’s quick
access menu. A pha characters are case
sensitive. Defau t code 0000 a ows direct
access without a code.
Status Text
The two sing e variab e screens inc ude a
message ‘Status: Good or Status: Bad’, the
Status Text function a ows this message to be
inhibited.
Variable Color
The background co or of variab es depends on
the IN_X Status Coi s. ‘Status: Good or Status:
Bad’ set a norma or inverted co or on the
variab e’s background. 'For furt er information
regarding status please refer to t e "Data
Status" paragrap on page 8 of "Modbus
Interface Guide" or page 16 of t e
"Programming guide”
Last Valid Input
This function a ows the number of process
variab es to be entered so that when scro ing
the disp ay unused screens are not shown.
Access code for the Configuration Menu
‘Code’ in the main menu defines the four digit
a phanumeric code that must be entered to gain
access to the instrument configuration menus.
A pha characters are case sensitive. Defau t
code 0000 a ows direct access without a code.
Unit information
Disp ays the instrument mode number and the
firmware version.
Configuration defaults
‘Defau t’ a ows the configuration defau t defined
in section 6.1 to be g oba y set.
6.4 Quick Access Menu
The quick access menu a ows an operator to
adjust the back ight bri iance and the disp ay
contrast without having access to the other
configuration parameters.
The quick access menu is accessed by operating
the P and Up push-buttons simu taneous y. If the
quick access menu is not protected by an access
code the bri iance and contrast contro s wi be
disp ayed immediate y. If an access code other
than the defau t code 0000 has a ready been
entered, the BA684D wi request that the access
code be entered. Section 6.2 exp ains how an
access code shou d be entered.
The back ight bri iance is adjusted using the Up
and Down push-buttons. Operating the P push-
button wi transfer contro to the disp ay contrast
adjustment. When both are set as required
operating the E button wi store both settings and
return the instrument to the operating mode.
1