INTRODUCTION
I-E96-303A
2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the output circuitry, control logic, data,
logic power and connections for the Analog Slave Output (ASO)
module. The ASO is an analog signal interface between a
Multi-Function Processor (MFP) or Multi-Function Controller
(MFC) module and process field devices. A master module com-
municates with its slave module on a 12-line slave expander
bus as shown in Figure
1-1
. Each slave on the bus has a
unique address set by its slave address dipswitch (S1).
Analog output signals are either 1 to 5 VDC or 4 to 20 mA. The
process requirements determine the output mode (current or
voltage). These signals, sent to the process, control field
devices.
MODULE BLOCK DIAGRAM
The ASO circuits control the fourteen analog outputs, and
transmit slave operating status back to an MFP module. Figure
2-1
is a block diagram of the ASO module. It illustrates signal
flow through the module. Figure
2-2
shows the analog output
circuit.
Analog Output Circuits
The analog output block consists of fourteen separate output
circuits that develop the analog outputs. They are closed loop
current/voltage output circuits that monitor and adjust the
output as compared to the sample/hold (S/H) output demand.
Figure 2-1. Analog Slave Output Module Block Diagram
SLAVE EXPANDER
BUS
LOGIC POWER
ANALOG
OUTPUTS (14)
TP27154A
A/D
CONVERTER
FEEDBACK
SELECT
REFERENCE
MODULE
STATUS
D/A
CONVERTER
SAMPLE/
HOLD
SAMPLE/
HOLD
SELECT
ANALOG
OUTPUT
P2
P3
P1
MODULE
STATUS LED
D/A
REGISTER
MODULE
MEMORY
CONTROL
LOGIC
SLAVE
EXPANDER BUS
INTERFACE
BUS FAULT
DETECTOR
1
8
OPEN
S1
OPEN
S2-S15
1
3
2
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