5.
Conversion Identifiers
- The Conversion Identifier only has an effect in User Polled Mode. When the module
receives this identifier with zero data bits it will sample its inputs. This is set as separate command to a data
request identifier so that it gives the module time to make a data conversion before having to send the data on the
CAN bus.
6.
Timer
- The timer value is in milliseconds (ms). A smaller value means data will be sent more frequently, a larger
value means data will be sent less frequently. The range of values that can be entered is 0 to 65535 however the
minimum value that should be entered is 10. Below this value data values may be repeated on successive
cycles. If a value of 0 is entered the module will change it to 1 on the next power cycle.
Frequency output can be calculated as follows:
Freq = (1/Timer) * 1000
The Timer value for a required frequency can be calculated as follows:
Timer = (1/Freq) * 1000
Some example Timer values are shown against the frequency output.
Timer Value
Frequency
10
100
50
20
100
10
400
2.5
1000
1
7.
Pack Data
- Byte-packing can be used to reduce the number of CAN messages required to transmit MIM data.
When turned OFF, each of the eight channels will be sent using a separate CAN Identifier message, each with a
Data Length Code (DLC) of 4 bytes. When Byte packing is turned ON, channels will be combined into pairs for
transmission over CAN, each message with a DLC of 8, as follows:
CAN ID
First 4 Data Bytes
Last 4 Data Bytes
CAN ID set for Channel 1
Channel 1 Data
Channel 2 Data
CAN ID set for Channel 3
Channel 3 Data
Channel 4 Data
CAN ID set for Channel 5
Channel 5 Data
Channel 6 Data
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04Modules_and_accessories/
Mini_Input_Module/
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