VIBROBIT MK40 User Manual

Module MK40 Setup Manual ВШПА.421412.304 И1
CAN2.0B interface
CAN2.0B interface provides for possibility of MK40 Module status data transfer to indicating units and statistics
gathering module. MK40Module does not receive any data via CAN2.0B interface, possibility of module setup by
means of CAN2.0B interface is not provided either.
Table 11. CAN2.0B interface parameters
Parameter name Value
Operating mode data transfer in active mode with possibility
of bus reset generation
Message format only extended
Exchange protocol unified for operation as part of “VIBROBIT
300” equipment set
MK40 Module indicating units code 0xC4 (196)
Data rate (one of speed values is setup), Kbit/c 1000; 500; 250; 200;
125; 100; 80; 40
CAN bus standards compliance ISO-11898
(1)
Maximum number of bus cross-points 112
(1)
Driver input resistance, kOhm, not less than 5
(1)
Electrical endurance, kV, not less than ±6
(1)
Galvanic isolation no
(1)
Note 1.On condition that MCP2551 driver is used.
Module CAN controller operates in active mode, i.e. generates dominant acknowledgement of received data
and can generate active reset message to CAN bus (for example, in case of incorrect indication of data rate)
All CAN bus cross-points must have equal data rate. At increase of data rate, CAN bus physical maximum light
decreases. CAN bus maximum allowed length at 1000Kbit/s data rate is 40 meters, and at 40Kbit/s data rate – 1000
meters.
Note. CAN2.0B bus terminator is provided on MK40 Module board. If the module is last to be connected to
RS485 bus and standard 120 Ohm bus terminator is missing, bridge with bus terminator must be installed on the
module board for normal operation of RS485 interface.
The following parameters must be set up for CAN2.0B interface operation.
• CAN2.0B operation enabling (CanEnabled);
• Data rate (CanSpeed);
• Module address (CanBasicAddress);
• Message transfer intervals (CanBasicTime);
• Data transfer enabling via measuring channels (CanBasicDataOut).
Measuring results data are transferred with CanBasicDataOut intervals. Individual message with unique
message code is generated or each of measuring channels:
0x30(48) – 1
st
measuring channel message;
0x31(49) – 2
nd
measuring channel message.
0x32(50) – Combined message. In normal state, message with 1
st
channel measurement result is transferred. In
case of 1
st
channel fault, message 2
nd
channel measurement is transferred. In case of both channels fault, message is
not transferred (implemented in module software version 3.40 and newer).
Messages are transferred sequentially: 1
st
measuring channel messages, then – 2ng measuring channel
messages. New message is not transferred to bus, until previous message is transferred. If current message is not
sent within 200ms, sending is cancelled.
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VIBROBIT MK40 Specifications

General

Brand	VIBROBIT
Model	MK40
Category	Control Unit
Language	English