How Communication Takes Place and I/O Image Table Mapping
3170-PDP
♦
FLEX Platform
FLEX I/O™ PROFIBUS Adapter
ProSoft Technology, Inc.
Page 31 of 152
August 23, 2007
1794-OE4 Memory Map
Decimal
Bit
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Size
Oct.
Bit
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Read
Words
PU Not used – set to 0
W3 W2 W1 W0 Read Word 1
S
Analog Data – Channel 0
Write Word 1
S
Analog Data – Channel 1
Write Word 2
S
Analog Data – Channel 2
Write Word 3
S
Analog Data – Channel 3
Write Word 4
Not used – set to 0
OE3 OE2 OE1 OE0 Write Word 5
Not used – set to 0 C3 C2 C1 C0 Not used – set to 0 F3
F2 F1 F0 Write Word 6
Not used – set to 0
Write Words 7
thru 14
Where: PU = Power up bit – included in series B modules only.
W = Diagnostic bits for current output wire broken or load resistance high. (Not used on voltage
outputs.)
S = Sign bit (in 2's complement)
OE = Output enable bits (bit 00 corresponds to output 0, bit 01 corresponds to output 1 and so on.
ATTENTION: These bits must be
set to 1.
C = Configure select bit
F = Full range bit
1794-OE4 Range Selection Bits (Write Word 6)
Channel No.
Channel 0
Channel 1
Channel 2
Channel 3
F0 C0 F1 C1 F2 C2 F3 C3
Decimal
Bit
00 08 01 09 02 10 03 11
4
to
20mA
0 1 0 1 0 1 0 1
0
to
10V
dc/0
to
20mA
1 0 1 0 1 0 1 0
to 10 to +10V dc
1
1
1
1
1
1
1
1
Off1
0 0 0 0 0 0 0 0
C = Configure select bit
F = Full range bit
1 When configured to off, individual channels will return 0V.
