Specifications

Analog Input Modules
64
31007715 6/2008
STB AVI 1270 Data and Status for the Process Image
Representing
the Analog
Input Data
The STB AVI 1270 sends a representation of the operating states of its input
channels to the NIM. The NIM stores this information in four 16-bit registers—two
data registers (one for each channel) and two status registers (one per channel).
The information can be read by the fieldbus master or, if you are not using a basic
NIM, by an HMI panel connected to the NIM’s CFG port.
The input data process image is part of a block of 4096 Modbus registers (in the
range 45392 through 49487) reserved in the NIM’s memory. The STB AVI 1270
module is represented by four contiguous registers in this block, which appear in the
following order:
z the data in input channel 1
z the status of input channel 1
z the data in input channel 2
z the status of input channel 2
The specific registers used are based on the module’s physical location on the
island bus.
Input Data
Registers
The first and third STB AVI 1270 registers in the input block of the process image
are the data words. Each register represents the input voltage of a channel in the
IEC data format. The data has 11-bit + sign resolution. The bit structure in each data
register is as follows:
Note: When this module is used with the STB NCO 2212 or STB NCO 1010
CANopen NIMs, you must set the analog global interrupt enable to index 6423,
subindex 1 in order to receive the input data. For more information on analog global
interrupt enable, see the Advantys STB Standard CANopen Network Interface
Module Applications Guide (890 USE 176) or the Advantys STB Basic CANopen
Network Interface Module Applications Guide (890 USE 193).
8
0
0=+
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
always 0
1=-
Sign bit
STB AVI 1270 Data Register Format
12 3 45
67
910111213
14
15
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