West Control Solutions N8080 User Manual
1
-DIN
8
DUAL COLOUR DISPLAY
TEMPERATURE INDICATOR
Product Manual
59135-2
HOW TO USE THIS MANUAL
This manual comprises two volumes:
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1
-DIN DUAL COLOUR DISPLAY
8
TEMPERATURE INDICATOR
Product Manual
Contents - Volume I
1 OPERATION MODE 1-1
1.1 FRONT PANEL 1-1
1.2 PARAMETER SEQUENCE 1-2
1.3 INPUT OVER-RANGE OR UNDER-RANGE 1-3
1.4 SENSOR BREAK 1-3
1.5 CHANGING AN ALARM VALUE 1-3
1.6 RESETTING A LATCHED ALARM 1-4
1.7 ALARM HYSTERESIS 1-4
1.8 SUMMARY OF PARAMETER IDENTIFIERS (SECONDARY DISPLAY) 1-4
2 PROGRAM MODE 2-1
2.1 ENTRY/EXIT 2-1
2.2 PARAMETER SELECTION 2-1
2.3 EDITING THE DISPLAYED PARAMETER (EDIT MODE) 2-2
2.4 PARAMETER SEQUENCE 2-3
3 SERIAL COMMUNICATIONS 3-1
3.1 DATA FORMAT/BAUD RATE 3-1
3.2 PROTOCOL 3-1
3.3 MESSAGE FORMAT 3-1
3.4 ERROR CONDITIONS 3-4
OM090-FM Volume I (iii)
1 OPERATION MODE
This mode covers day-to-day operation of the Indicator.
1.1 FRONT PANEL
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Key/Display/Indicator Function
Down key (Ú ) In Edit Mode, decrements the flashing digit in the Primary Display.
Scroll key (Ø ) Puts Indicator into Edit Mode; in Edit Mode, selects digit to be altered
(selected digit is flashing) in Primary Display. Wrap-around occurs from
right-most digit to left-most digit.
Program Key (PGM ) Selects parameter to be viewed/edited. In Edit Mode, confirms changed
parameter value.
Reset key (RST ) If the process variable is displayed, resets the latched Alarm 1. If the
Maximum (High) Value, Minimum (Low) Value or Alarm 1 Elapsed Time is
displayed, resets the displayed parameter.
Down (Ú ) and Scroll
(Ø ) keys
Primary Display Normally displays the process variable value. Displays other Operation
Secondary Display Shows a single-character identifier for the parameter value being
OP1 indicator ON when Alarm 1 is active.
OP2 indicator ON when Alarm 2 is active.
If pressed simultaneously in Edit Mode, will abort the Edit operation and
will restore the parameter to its initial value.
Mode parameters when the Program (PGM) key is used. If the Help
Facility is enabled (see Subsection 2.4), this display shows the parameter
description for three seconds before displaying the parameter value.
displayed (blank for process variable).
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1.2 PARAMETER SEQUENCE
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1.3 INPUT OVER-RANGE OR UNDER-RANGE
If the input becomes over-range or under-range, the primary display will show:
The display will disappear when the input returns within the input scale range.
1.4 SENSOR BREAK
This indicates that there is a break in the input sensor circuit.
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1.5 CHANGING AN ALARM VALUE
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1.6 RESETTING A LATCHED ALARM
If Relay 1 is configured to act as a latched Alarm 1 relay, when this alarm is
active, it can be reset by selecting the process variable display and then pressing
the Reset (RST) key. The alarm will not be reset if the alarm condition exists at the
time reset is attempted.
1.7 ALARM HYSTERESIS
The Alarm Hysteresis parameter applies a hysteresis band on the “safe” side of the
Alarm value. The effect of the hysteresis value (a percentage of input span) on the
operation of the different types of alarm is illustrated below:
1.8 SUMMARY OF PARAMETER IDENTIFIERS (SECONDARY DISPLAY)
Secondary Display Displayed Parameter
Blank Process variable
Maximum (High) value
Minimum (Low) value
Alarm 1 Elapsed Time
Alarm 1 value
Alarm 1 Hysteresis value
Alarm 2 value
Alarm 2 Hysteresis value
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2 PROGRAM MODE
2.1 ENTRY/EXIT
Use the Program (PGM) key in the same way to exit Program Mode (i.e. return to
Operation Mode).
2.2 PARAMETER SELECTION
2.2.1 With Help Facility Enabled
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2.2.2 With Help Facility Disabled
2.3 EDITING THE DISPLAYED PARAMETER (EDIT MODE)
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2.4 PARAMETER SEQUENCE
The Program Mode parameter sequence is as follows:
Parameter
Description
(Primary
Display)
Parameter Description Adjustment Range
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Retransmission
Scale
Minimum
Retransmission
Scale
Maximum
Process
Variable
Offset
Input Filter
Time
Constant
Communications
Address
The lower end of the linear
scale for the
re-transmission output,
expressed as the value
corresponding to the
minimum output signal.
The upper end of the
linear scale for the
re-transmission output,
expressed as the value
corresponding to the
maximum output signal.
Corrects a known offset of
the input in order to
display more accurately
the process value.
Filters the input over a
user-definable time period
to minimise the effect on
the process variable of
any extraneous impulses
The unique serial
communications address
of the instrument.
−19999 to 99999 −19999
−19999 to 99999
− 19999 to 99999
0.0 (OFF) to 100.0 2.0
1 to 99 1
99999
0.00
Baud Rate Serial communications
speed
Display
Colour
Change
Alarm Lock Enables/disables the
Help Prompt Determines whether the
Defines the colour of the
primary and secondary
displays prior to/after the
preset value (e.g. Alarm
level) is reached.
changing of alarm values
via the front panel.
Primary Display shows the
parameter description for
3 seconds before a
parameter value is shown.
1200, 2400, 4800 or 9600 4800
Red
Green
Green
to Red
Red to
Green
Enabled
Disabled
Yes
No
Green to
Red
Enabled
Yes
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3 SERIAL COMMUNICATIONS
The Serial Communications option is a standard RS485 communications link. Up to
32 standard RS485 loads may be presented to a single loop on this link. Each
Indicator presents ¼ standard, therefore up to 128 may be connected to a single
loop (ignoring the load presented by the master device). However, addresses are
restricted to the range 1 to 99.
3.1 DATA FORMAT/BAUD RATE
Data format is fixed at one start bit, seven data bits, 1 parity bit (even parity) and
1 stop bit i.e. a 10-bit data word. Baud rates supported are 1200, 2400, 4800 and
9600. The half-duplez line turn-round time is fixed at 6ms regardless of Baud rate.
The maximum inter-character delay is 120ms. The No Reply timeout is 2 seconds.
Data is expressed as a five-digit signed hexadecimal number in which the
following characters are permitted:
0 1 2 3 4 5 6 7 8 9 A B C D E F
Note that all the non-numeric characters are upper case. The detection of any
characters other than these will be regarded as a syntax error. Where a value
carries a decimal point, the point position is implicit and the responsibility for
interpreting it lies with the user.
3.2 PROTOCOL
The protocol operates on a single master basis only. All communication is initiated
by the master device.
The communications addresses available are in the range 1 - 99. Address 0 is
used for broadcast Parameter Write operation messages. When a message is
broadcast, the receiving instruments will attempt to implement the instruction but
will not reply.
3.3 MESSAGE FORMAT
Each message starts with a Start of Message character (L) and finishes with an End
of Message character (*). A reply from the addressed instrument will contain either
a positive acknowledgement or a negative acknowledgement. A positive
acknowledgement has the character A immediately preceding the End of
Message character; a negative acknowledgement has the character N
immediately preceding the End of Message character.
There are three message formats; they permit instrument identification, Parameter
Read operations and Parameter Write operations.
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3.3.1 Form 1 Message
The master device sends a Form 1 message to ascertain whether a specific
communications address is occupied by an instrument. If there is an instrument at
that address, a reply (with a positive acknowledgement) is received. If there is no
instrument at that address or if there is a communications link failure, no reply is
received. The message from the master device is of the form:
Laa??*
where aa is the address (a two-digit hexadecimal number). The reply from the
addressed instrument is of the form:
Laa?A*
where aa is the same address as in the received message.
3.3.2 Form 2 Message
This message implements a Parameter Read operation. The message from the
master device is of the form:
Laap?*
where aa is the address (a two-digit hexadecimal number)
p is a single-character parameter identifier (see Table 3-1)
The reply, if the Parameter Read operation is successful, is of the form:
LaapnnnnnA*
where aa is the same address as in the received message
p is a single-character parameter identifier (see Table 3-1)
nnnnn is the data (a five-digit hexadecimal number)
If the specified parameter is invalid (e.g. not applicable to the addressed
instrument), the reply is of the form:
Laap00000A*
where aa is the same address as in the received message
p is a single-character parameter identifier (see Table 3-1)
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