4–7
Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter
Publication 17946.5.2 - May 1996
Analog Output Module (1794-OE4/B) Write Configuration
Block
Word/Dec. Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Word/Octal Bit
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Write Word 0
S
Analog Data - Channel 0
Word 1
S
Analog Data - Channel 1
Word 2
S
Analog Data - Channel 2
Word 3
S
Analog Data - Channel 3
Word 4
0
Not used - set to 0
M3 M2 M1 M0
Word 5
0
Not used - set to 0 C3
C2
C1
C0
Not used - set to 0
F3
F2
F1
F0
Word 6 thru 9
Not used - set to 0
Word 10
S
Safe State Value - Channel 0
Word 11
S
Safe State Value - Channel 1
Word 12
S
Safe State Value - Channel 2
Word 13
S
Safe State Value - Channel 3
Where:
S = Sign bit (in 2's complement)
M = Multiplex control
C = Configure select bit
F = Full range bit
Range Selection Bits for the 1794-OE4/B Analog Output Module
(Word 5)
Channel No.
Channel 0
Channel 1
Channel 2
Channel 3
F0
C0
F1
C1
F2
C2
F3
C3
Decimal Bits (Octal Bits)
00
08 (10)
01
09 (11)
02
10 (12)
03
11 (13)
4-20mA
0
1
0
1
0
1
0
1
0-10V dc/0-20mA
1
0
1
0
1
0
1
0
10 to +10V dc
1
1
1
1
1
1
1
1
Off
1
0
0
0
0
0
0
0
0
C = Configure select bit
F = Full range bit
1
When configured to off, individual channels will send 0V or 0mV on Series B modules. On Series A modules, 2V or 4mA is output
until the module is configured.
Word/Bit Descriptions for the 1794-OE4/B Analog Output
Module Write
Word
Decimal Bit
(Octal Bit)
Definition
Write Word
0
Bits 00-14
(00-16)
Channel 0 analog data
- 12bit left justified two's complement number; unused
lower bits are zero; 420mA uses all 16 bits.
0
Bits 15 (17)
Channel 0 analog data sign bit.