Omron NE1A Series - Devicenet Communications Specifications

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Specifications Section 2-2
2-2-2 DeviceNet Communications Specifications
Item Specifications
Communications
protocol
Conforms to DeviceNet.
Connection method The multidrop and T-branch connections can be combined (for main line and branch lines).
Baud rate 500 kbits/s, 250 kbits/s, 125 kbits/s
Communications
medium
Special cable with 5 lines (2 communications lines, 2 power lines, 1 shield line)
Communications
distance
Baud rate Maximum network length Branch length Total length
500 kbits/s 100 m max. (100 m max.) 6 m max. 39 m max.
250 kbits/s 250 m max. (100 m max.) 6 m max. 78 m max.
125 kbits/s 500 m max. (100 m max.) 6 m max. 156 m max.
The numbers in parentheses are the lengths when Thin Cable is used.
Communications power
supply
11 to 25 VDC
Connected nodes 63 nodes max.
Safety I/O
communications
(Pre-Ver. 1.0 Control-
lers)
Safety Master Function:
• Maximum number of connections: 16
• Maximum data size: 16 bytes input or 16 bytes output (per connector)
• Connection type: Single-Cast, Multi-Cast
Safety Slave Function:
• Maximum number of connections: 4
• Maximum data size: 16 bytes input or 16 bytes output (per connector)
• Connection type: Single-Cast, Multi-Cast
Safety I/O
communications
(Controllers with unit
version 1.0 or later)
Safety Master Function:
• Maximum number of connections: 32
• Maximum data size: 16 bytes input or 16 bytes output (per connector)
• Connection type: Single-Cast, Multi-Cast
Safety Slave Function:
• Maximum number of connections: 4
• Maximum data size: 16 bytes input or 16 bytes output (per connector)
• Connection type: Single-Cast, Multi-Cast
Standard I/O
communications
Standard Slave Function
• Maximum number of connections: 2
• Maximum data size: 16 bytes input and/or 16 bytes output (per connector)
• Connection type: Poll, Bit-strobe, COS, Cyclic
Message communica-
tions
Maximum message length: 552 bytes