2–16
How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
Analog Combo Module (1794IE4XOE2) Image Table Mapping
Module Image
I/O Image
Input Data Channel 0
Input Data Channel 1
Input Data Channel 2
Input Data Channel 3
Output Data Channel 0
Output Data Channel 1
Underrange & Diag.
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Full Range and Configure Select
Not used
Input Size
Output Size
0 to 4 Words
0 to 5 Words
Read
Write
OE
PU
Memory Map of Analog Combo Module Image Table –
1794-IE4XOE2
Dec. 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
Size
S
Analog Value Input Channel 0
Read Word 1
S
Analog Value Input Channel 1
Read Word 2
S
Analog Value Input Channel 2
Read Word 3
S
Analog Value Input Channel 3
Read Word 4
PU
Not used - set to 0
W1 W0 U3
U2
U1
U0
Read Word 5
S
Analog Data - Output Channel 0
Write Word 1
S
Analog Data - Output Channel 1
Write Word 2
Not used - set to 0
OE1 OE0
Write Word 3
Not used
C5
C4
C3
C2
C1
C0
0
0
F5
F4
F3
F2
F1
F0
Write Word 4
Not used - set to 0
Write Word 5 thru 10
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.)
U = Underrange bits for 420mA inputs
OE = Output enable bits (bit 00 corresponds to output 0, bit 01 corresponds to output 1).
ATTENTION: These bits must
be set to 1.
S = Sign bit (in 2's complement)
C = Configure select bit
F = Full range bit