Rockwell Automation 1798-IB4 FlexArmor User Manual - Manual (Page 27)

Publication 1798-UM001B-EN-P - November 2002
How Communication Takes Place and I/O Image Table Mapping 2-13
Range Selection Bits for the 1798-OE2
Word/Bit Descriptions for the 1798-OE2 Analog Output Module
(Write Word 6)
Channel No. Channel 0 Channel 1
F0 C0 F1 C1
Decimal Bit 00 08 01 09
0-10V dc/0-20mA 1 0 1 0
4-20mA 0 1 0 1
10 to +10V dc 1 1 1 1
Off 1 0 0 0 0
C = Configure select bit; F = Full range bit
1. When configured to off, individual channels will return 0V.
Word Decimal Bit Definition
Read Word 1
Bits 00-01 Current outputs only - When set (1), the wire on the
output is broken or the load resistance is too high. Bit
00 corresponds to channel 0, bit 01 corresponds to
channel 1.
Bit 02-14 Not Used - Set to 0.
Bit 15 Power Up bit - This bit is set to 1 when all bits in the
configuration register are 0 (unconfigureed state).
The configuration register can be cleared by either of
the reset inputs, or by the user writing all zeroes to it.
Write Word 1
Bits 00-14 Channel 0 analog data - 12-bit left justified two’s
complement number; unused lower bits are zero;
4-20mA uses all 16 bits.
Bit15 Channel 0 analog data sign bit.
Write Word 2
Bits 00-14 Channel 1 analog data - 12-bit left justified two’s
complement number; unused lower bits are zero;
4-20mA uses all 16 bits.
Bit15 Channel 1 analog data sign bit.
Read Word 3-4 Not Used
Write Word 5
Bit 00-01 Output Enable Bits. Bit 00 corresponds to output 0,
01 corresponds to output 1. These bits must be set
to 1.
Bits 02-15 Not Used - Set to 0.
Write Word 6
Bits 00-02 Full range bits (F) for individual channels - Bit 00
corresponds to input channel 0, bit 01 corresponds to
input channel 1. Refer to the range selection above.
Bits 08-09 Configure select bits (C) for individual channels - Bit
08 corresponds to input channel 0, bit 09 corresponds
to input channel 1. Refer to range selection above.
Write Word 7-14 Not Used - Set to 0.