I/O Mapping
Original instructions
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Overview
The 170 ANR 120 90 TSX Momentum I/O base supports 6 analog inputs, 4 analog outputs,8 discrete inputs and 8 discrete outputs. This section contains information about the mapping of the output words into the analog/discrete output values, the usage of output words for channel configuration and the mapping of analog/discrete input values into input words.
I/O Map
The I/O base must be mapped as 12 contiguous input words and 12 contiguous output words, as follows:
Word
Input Data
Output Data
1
Status word (module status)
System information
2
State of the 8 discrete inputs
Register for discrete reaction in a fail state
3
Analog input word channel 1
Register for analog reaction in a fail state
4
Analog input word channel 2
User defined analog fail state values for channel 1
5
Analog input word channel 3
User defined analog fail state values for channel 2
6
Analog input word channel 4
User defined analog fail state values for channel 3
7
Analog input word channel 5
User defined analog fail state values for channel 4
8
Analog input word channel 6
State of the 8 discrete outputs
9
Not used
Analog output word channel 1
10
Not used
Analog output word channel 2
11
Not used
Analog output word channel 3
12
Not used
Analog output word channel 4
Analog I/O MAP
170 ANR 120 90 analog values are mapped as follows:
NOTE: The display is standardized and in each case the analog value will appear flush left.
Discrete I/O MAP
The 170 ANR 120 90 base returns eight discrete input bits to the Processor in one 16-bit word (3x). The input points are field wired to row 2 of the base. The Processor sends eight discrete output bits to the base as a single 16-bit word (4x). The output points are field wired to row 3. The figure below shows how the data is mapped between the base and the CPU.
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