INTRODUCTION
I-E96-316A
2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the inputs, outputs, logic power and con-
nections for the Quick Response Slave (QRS) module. The QRS
is a process field I/O interface for a Multi-Function Processor
(MFP) or Multi-Function Controller (MFC) module. The slave
module circuitry:
1. Performs analog to digital (A/D) conversion. It changes
analog inputs to digital values the MFP can process.
2. Performs digital to analog (D/A) conversion. It changes the
MFP digital values to analog voltage or current signals to con-
trol process field devices.
3. Accepts digital field inputs, and isolates the module cir-
cuitry from the process.
4. Outputs digital signals to process field devices, and isolates
the module circuitry from the process.
The MFP communicates with its slave modules on a 12-line
slave expander bus as shown in Figure
. Each slave on the
bus has a unique address set by its slave address dipswitch
(S1). Figure
is a block diagram of the QRS.
Figure 2-1. Quick Response Slave Module Block Diagram
1
8
OPEN
1
6
OPEN
LOGIC POWER
ANALOG OUTPUT
MODE SWITCH
DIGITAL INPUTS (3)
ANALOG INPUTS (4)
DIGITAL OUTPUTS (4)
ANALOG OUTPUTS (2)
SLAVE EXPANDER
BUS
TP27111A
DIGITAL I/O
BUFFER
A/D
CONVERTER
INPUT
SELECT
INPUT
CONDITIONING
SLAVE
EXPANDER BUS
INTERFACE
BUS FAULT
DETECTOR
MODULE
STATUS
THRESHOLD
DETECTION
D/A
CONVERTER
E/I SWITCH
REFERENCE
OUTPUT
ISOLATION
INPUT
ISOLATION
DRIVER
P2
P3
P1
S1
ADDRESS
SWITCH
ANALOG OUTPUT
DEFAULT SWITCH
S2
S3
MODULE
STATUS LED
C1
C2
C3
C4
