ABB Triguard SC300E User manual

Triguard SC300E
MDO16GNS
16-Channel Digital Output Module
48Vdc
(MDO16GNS)
Issue 2 October 2005
INTRODUCTION
PURPOSE
The 48Vdc Digital Output Module MDO16GNS provides the output control interface between
the
SC300E processing environment and up to 16 field items. All field outputs from the module
are
galvanically isolated from the system.
Circuit triplication and voting procedures make the module single - fault tolerant and latent
testing ensures that the failure of anormally ‘ON’ (energised) or ‘OFF’ channel will be
recognised a nd reported to the system. Front panel indicators show the state of all channels,
the circuit ‘on - line’ status and the health of the module.
The module, which is compatible with ‘dual slot hot repair’, can be fitted in any of the ten I/O
slots in the SC300E chassis. ‘Wrong slotting’ is prevented by physical coding .The SC300E
main processor software identifies the module via abuilt - in hardware identifier.
Channel outputs leave the module via the DIN 41612 ‘rear plug - up’ system on the chassis
backplane.
This document is intended to provide ageneral understanding of the function of the module
sufficient to enable basic maintenance operations to be effected in the field.
ASSOCIATED DOCUMENTATION
Reference No Title
008 - 5097 Chassis User Manual
008 - 5143 T DO16AIE 16 - Channel Digital Output Termination Card
Introduced Power, 48Vdc User Manual
008-5141

2
MDO16GN
S
October
200
5
–
Issue 2
Triguard
SC30
0E

MDO16G
N
S
October
200
5
–
Issue 2
3
Triguard SC300E MDO16GNS 16 - Channel D/O Module 48Vdc
Mechanical coding
block (Upper)
ConfigurationLinks
Link3
ICC
B
HL
V
HW
GTZ
Figure 1 - 1General view and front panel detail
321
320
Link 1
Connector
J1
Common Interface (CI)
Module
Connector J2
Connector J3
Mechanical coding
block (Lower)

4
MDO16GN
S
October
200
5
–
Issue 2
Triguard
SC30
0E
SPECIFICATION
Model MDO16GNS
Channels 16
Architecture TMR
Indicators: Input
Modules
One per point
Health, 3 x On Line
Output driver FET
Voltage range
48Vdc ±10%
Voltage drop
Less than 3V
Maximum drive
Resistive load: 1A per channel
Tungsten load: 0.125A per channel
Surge limiting
3A peak
Isolation
1kVdc field to system, commoned supply
Minimum load per output
12mA (24mA if dual slot hot repair)
Module power consumption excluding field
power dissipation in module
4W
Module power consumption including field
power dissipation in module
6W @minimum load
36W @maximum load
Overall size (mm)
Overall
size (inches)
400(9U)H x397L x28W
15.75H x15.63L x1.1W
Weight 2.1kg
ENVIRONMENTAL SPECIF ICATIONS
The maximum ambient temperature measured at the hottest point within the Triguard system
shall
not be greater than 60 degrees centigrade.
Temperature operating: +5°C to +60°C
Temperature
storage: - 25°C to +70°C
Humidity 5% to 95% non - condensing at ambient <40°C
EMC/RFI
Immunity Tested and certified to IEC 1131 - Part 21994
Vibration/Shock Tested and certified to IEC 1131 - Part 21994
Certification:
Gene
ral Certification: Ref. SC300E TMR Product Guide (ref 008 - 5209).

MDO16G
N
S
October
200
5
–
Issue 2
5
Triguard SC300E MDO16GNS 16 - Channel D/O Module 48Vdc
TRANSPORT AND HANDLING
The MDO16GNS must be transported and stored in its original packing material which should
be
retained for this purpose.

6
MDO16GN
S
October
200
5
–
Issue 2
Triguard
SC30
0E
TECHNICAL DESCRIPTIO N
PHYSICAL
The MDO16GNS is a9U high module with integral front panel and rear connectors. A
daughterboard carries the common interface circuits. Figure 1 - 1shows the general layout,
including the location of the connectors and front panel details.
Mechanical coding blocks
All Input/Output modules carry two coder blocks equipped with pins which mate with holes in
corresponding
blocks in the chassis and prevent the module being inserted into the wrong slot.
The
pins in the module blocks are factory installed in apattern determined by the module and
corresponding
set screws are removed from the chassis coder blocks to enable fitting. Unused
holes
are plugged with set screws. The chassis slot coder block configuration for this module
is shown in Figure 2 - 1 .
Figure 2 - 1Chassis slot coder blocks configuration
EXTERNAL CONNECTIONS
Field Circuits
The field load circuit shown in Figure 2 - 2is the typical required for the safe connection of field
loads
to the MDO16GNS. For any unused channel adummy field load (value 10k ohm) should
be used. We however, recommend the use of their 16 - Channel Digital Output Termination
Card TDO16AIE which offers full connection facilities with dummy loads, indicating fuses and
alarm
outputs (See Section 1.2, Associated documentation).

MDO16G
N
S
October
200
5
–
Issue 2
7
Triguard SC300E MDO16GNS 16 - Channel D/O Module 48Vdc
Figure 2 - 2Basic field load circuit
Module connectors
The system bus connector is J1 and the common interface is connected via J4 and J5 (not
shown).
All the digital outputs are routed through connector J2. In the external connection
diagram (Figure 2 - 3 ) the following symbols are used:
0 =First mate (long pin)
x = Connector pin
Earth = Connected to chassis
+ve = Field supply in
- ve =Field supply return
O/P =Channel output
WARNING
J3 pin 1c is connected to earth.
All other pins on J3 are connected to field supply return but this field supply return may not be
at earth potential .

8
MDO16GN
S
October
200
5
–
Issue 2
Triguard
SC30
0E
Figure 2 - 3Field output connector J2 pinouts
Connector J3 pin 1c is connected to earth.
All other pins on J3 are connected to field supply return.
THEORY OF OPERATION
The channel output command information from the main processor follows three identical paths
through
the MDO16GNS (see Figure 2 - 4), each path is controlled by its own microcontroller in
the common interface. In order to minimise the number of data connections acro ss the 1kV
system - to - field barrier, the channel data are converted to serial form before entering the module
from the common interface. In this manner 16 output channels can be served by just three
paths instead of 48.
The three data streams are each applied to opto - isolators which mark the interface between
the system and field sides of the circuit and provide asystem - to - field channel isolation of 1kV.

MDO16G
N
S
October
200
5
–
Issue 2
9
Triguard SC300E MDO16GNS 16 - Channel D/O Module 48Vdc
The data streams are then applied to the 16 - bit output shift registers. The serial bits are
clocked s uccessively into the shift registers until the 16th bit has been received. The registers
then latch the data and present it on the 16 - bit busses (CHANA, CHANB and CHANC) to the
output
switches. The data is continuously refreshed in this manner and updated at each scan
of the SC300E system.
The output switch for each channel comprises six FETs connected in the series/parallel
network shown and providing 2out of 3majority voting between the three paths A, Band C. A
front panel LED at the switch output is lit when the switch is closed. Voltage and current
monitoring circuits are also connected to the switches to provide outputs for the Latent Fault
Detection
(LFD) system. These outputs are fed back to the microcontrollers via dedicated shift
registers and o pto - isolators. The feedback information confirms that the output has switched to
the
commanded state and that the line is not open or short circuit.
Testing of the output switches by the LFD circuits is co - ordinated by the microcontrollers on
the
common i nterface. When all outputs are in the healthy condition and the microcontrollers
confirm no faults present, the SC300E processors (main processors) will instruct each
microcontroller in turn to switch its output alone to the opposite state and confirm the correct
operation of its individual output switch.
The module power requirements are served from two different sources. The power for the
output - side circuits is derived from the chassis 12V supply via dc/dc converters. All of the
supplies are monitored. Electronic fuse circuits sense the current in each output path and cut
off the upper FET if the current exceeds apredetermined limit.
An On/Off Line Request switch on the front panel enables arequest to be sent to the SC300E
system that the module be ta ken off - line for maintenance purposes or returned on - line. The
module contains ahardware identity circuit that enables system identification of the module,
and
three manual links 1, 2and 3. Link 1allows the module to be set up for 321 or 320 mode
operat ion which sets the threshold that determines how much of the circuit can be degraded
while
still preserving overall operation. 320 mode means that the system will continue to
function with two out of three serviceable circuits. If the number falls to one o ut of three the last
read data is maintained. In 321 mode the system will continue to function with one out of three
serviceable
circuits. If that fails the last read data is maintained and the module is taken off -
line.
Link 2(HLV/GTZ) determines whether , in the event of afailure due to 321/320 action, the last
read values are held (HLV) or are set to zero (GTZ). Link 2is only active however, if Link 3
(ICCB/HW) is set to HW. If Link 3is set to ICCB Link 2is ignored and its function determined
by soft ware.

10
MDO16GN
S
October
200
5
–
Issue 2
Triguard
SC30
0E
DC
Figure 2 - 4. MDO16GNS – Block Diagram