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The analog generator or
D/
A converter consists
of a resistance-current divider network connected to
a set of magnetically latched relay contacts operated
by the multiple output controller. A power supply,
usually 42
volts
or less, provides single polarity
outputs. Two power supplies are provided if bi-polar
outputs are required. The
analog
output is pro-
portional to the binary value of the 16 data bits in the
MOC command word.
Standard analog outputs are:
0-lMA
0-2MA
0-5MA
0-lOMA
0-20MA
0-5V
0-lOV
23
(Offset)
1-5MA
2-lOMA
4-20MA
5-25MA
1-5V
2-lOV
1 Means
+
or Set
0 Means - or Reset
Data
±
Latched Relay
+
8
The RTOS software that actually drives the MOC
utilizes status tables in memory, permitting the
programmer to concern himself with only those bits
in a
given
group which he wants to change and to
specify only their desired states. This software also
allows using the MOC to simulate
a
timed output con-
troller, useful on systems where the MOC is not
fully time-loaded and where timed outputs are
occasionally required.
Safety characteristics of the MOC hardware
protect the process from
a
wide range of MOC hard-
ware failures and even from certain programming
errors, such as addressing a non-existent
group.
Timed Output Controller
The timed output controller is used for pulsed
outputs to set point controllers and for timed out-
puts on systems whose MOC is heavily time-
loaded.
{]
Delay Time
0 = Relay 4 ms (nominal)
1 = Solid State 75 µs (nominal)
or 20-150 ms
r{
Ready Signal
0
=Normal
1
=
Alternate
7 6 5
0
Group Address
Decode and
Drive
Single Contact or
Groups of Contacts
Output Function
-Single Contact
-Binary to BCD
-D/
A Conversion
-Etc.
Multiple Output Control
34
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