MELSECNET/10 (PLC TO PLC NETWORK)
4.2 Performance Specifications Comparisons
Item
Specifications
Compatibility Precautions for replacement AJ71LP21
A1SJ71LP21
AJ71QLP21 A1SJ71QLP21
QJ71LP21-25 MELSECNET/10 mode) Maximum
number of link points per network
LX/LY 8192 points LB 8192 points LW 8192 points Maximum number of link
points per station {(LY + LB) 8 + (2 × LW)} 2000 bytes Communication speed 10Mbps
Communication method Token ring method
Synchronous type Frame synchronization method
Encoding method NRZI coding (Non Return to Zero Inverted) Transmission method Duplex loop
Transmission format HDLC standards (frame format)
Maximum number of networks
255 (Total number of PLC to PLC networks and remote I/O networks)
239 (Total number of PLC to PLC networks and remote I/O networks)
Network No.240 to No.255 cannot be set.
Alternate them with unused network No.
Maximum number of
groups 9
Number of stations
connected in one network 64 stations (Control station: 1, normal station: 63)
Applicable cable SI optical cable, H-PCF optical cable, Broad-band H-PCF optical cable, and QSI optical cable
Overall distance 30km Distance between
stations
SI optical cable: 500m, PCF optical cable: 1km, Broad-band H-PCF optical cable: 1km, and QSI optical cable: 1km
Error control system CRC(X16 + X12 + X5 + 1) and retry by a time over
RAS function
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions Transient transmission • N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated link instruction, refer to Section 4.6.2.
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
(2) Performance comparison of AJ71QLP21S/A1SJ71QLP21S and QJ71LP21S-25 (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for replacement AJ71LP21/A1SJ71LP21 QJ71LP21-25
(MELSECNET/10 mode) Maximum number
of link points per network
X/Y 8192 points
B 8192 points
W 8192 points
Maximum number of link points
per station {(Y + B) 8 + (2 × W)} 2000 bytes Communication speed 10Mbps
Communication method Token ring method
Synchronous type Frame synchronization method
Encoding method NRZI coding (Non Return to Zero Inverted) Transmission method Duplex loop
Transmission format HDLC standards (frame format)
Maximum number of networks 239 (Total number of PLC to PLC networks and remote I/O networks)
Maximum number of groups 9 Number of stations connected in
one network 64 stations (Control station: 1, normal station: 63) Applicable cable SI optical cable, H-PCF optical cable, Broad-band H-PCF
optical cable, and QSI optical cable
Overall distance 30km
Distance between stations SI optical cable: 500m, H-PCF optical cable: 1km, Broad-band H-PCF optical cable: 1km, and QSI optical cable: 1km Error control system CRC(X16 + X12 + X5 + 1) and retry by a time over
RAS function
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions
Transient transmission
• N:N communication (e.g.
monitor, program up/
download)
• Dedicated link instruction
• N:N communication (e.g.
monitor, program up/
download)
• Dedicated link instruction
For comparison of dedicated link instruction, refer to Section 4.6.2.
External power supply
Voltage 20.4VDC to 31.2VDC 20.4VDC to 31.2VDC
Current 0.2A 0.20A
Applicable
cable size 0.75 to 2mm2 0.3 to 1.25mm2
Cables of 1.25mm2 or more should be replaced with cables of 0.3 to 1.25mm.
Number of occupied I/O points
AJ71QLP21S: 32 points per slot (I/O assignment: special 32 points)
A1SJ71QLP21S: 48 points 2 slots (I/O assignment:
empty 16 points, special 32 points)
48 points 2 slots (I/O assignment:
empty 16 points, intelli. 32 points)
When the AJ71QLP21S is replaced, set the [Empty 16 points] of first half to the [Empty 0 point] with I/O assignment.
first half second half
first half
second half
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
(3) Performance comparison of AJ71LP21G/AJ71QLP21G and QJ71LP21G (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for replacement
AJ71LP21G AJ71QLP21G QJ71LP21G
(MELSECNET/10 mode) Maximum
number of link points per network
LX/LY 8192 points LB 8192 points LW 8192 points Maximum number of link
points per station {(LY + LB) 8 + (2 × LW)} 2000 bytes Communication speed 10Mbps
Communication method Token ring method
Synchronous type Frame synchronization method
Encoding method NRZI coding (Non Return to Zero Inverted) Transmission method Duplex loop
Transmission format HDLC standards (frame format)
Maximum number of networks
255 (Total number of PLC to PLC networks and remote I/O networks)
239 (Total number of PLC to PLC networks and remote I/O networks)
Network No.240 to No.250 cannot be set.
Alternate them with unused network No.
Maximum number of
groups 9
Number of stations
connected in one network 64 stations (Control station: 1, normal station: 63) Applicable cable GI optical cable
Overall distance 30km Distance between
stations GI optical cable: 2km
Error control system CRC(X16 + X12 + X5 + 1) and retry by a time over
RAS function
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions Transient transmission • N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated link instruction, refer to Section 4.6.2.
Number of occupied I/O points
32 points per slot (I/O assignment:
special 32 points)
32 points per slot (I/O assignment: intelli. 32 points)
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
(4) Performance comparison of AJ71LR21/A1SJ71LR21/AJ71QLR21/A1SJ71QLR21 and QJ71BR11 (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for replacement AJ71LR21
A1SJ71LR21
AJ71QLR21 A1SJ71QLR21
QJ71BR11 (MELSECNET/10 mode) Maximum
number of link points per network
LX/LY 8192 points LB 8192 points LW 8192 points Maximum number of link
points per station {(LY + LB) 8 + (2 × LW)} 2000 bytes Communication speed 10Mbps
Communication method Token ring method Token bus method
Nothing to be noted though the communication method differs.
Synchronous type Frame synchronization method Encoding method Manchester code
Transmission method Duplex loop Single bus
The loopback function and multiplex transmission function cannot be used on a coaxial bus system. To use the functions, using an optical loop system is recommended.
Transmission format HDLC standards (frame format)
Maximum number of networks
255 (Total number of PLC to PLC networks and remote I/O networks)
239 (Total number of PLC to PLC networks and remote I/O networks)
Network No.240 to No.250 cannot be set.
Alternate them with unused network No.
Maximum number of
groups 9
Number of stations connected in one network
64 stations (Control station: 1, normal station: 63)
32 stations (Control station: 1, normal station:
31)
Normal stations up to 31 stations can be used on a coaxial bus system. To use 32 normal stations or more, using an optical loop system is recommended.
Applicable cable 3C-2V, 5C-2V, 5C-FB
Overall distance 3C-2V: 19.2km 5C-2V, 5C-FB: 30km
3C-2V: 300m 5C-2V, 5C-FB: 500m
Either use an A6BR10/
A6BR10-DC type repeater unit, or use an optical loop system.
Distance between stations
3C-2V: 300m 5C-2V, 5C-FB: 500m
Error control system CRC(X16 + X12 + X5 + 1) and retry by a time over
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
RAS function
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions
The loopback function cannot be used on a coaxial bus system. To use the loopback function, using an optical loop system is recommended.
Transient transmission • N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated link instruction, refer to Section 4.6.2.
Number of occupied I/O points
32 points per slot (I/O assignment:
special 32 points)
32 points per slot (I/O assignment: intelli. 32 points)
Item
Specifications
Compatibility Precautions for replacement AJ71LR21
A1SJ71LR21
AJ71QLR21 A1SJ71QLR21
QJ71BR11 (MELSECNET/10 mode)
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
(5) Performance comparison of AJ71BR11/A1SJ71BR11/ AJ71QBR11/A1SJ71QBR11 and QJ71BR11 (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for replacement AJ71BR11
A1SJ71BR11
AJ71QBR11 A1SJ71QBR11
QJ72LP21G (MELSECNET/10 mode) Maximum
number of link points per network
LX/LY 8192 points LB 8192 points LW 8192 points Maximum number of link
points per station {(LY + LB) 8 + (2 × LW)} 2000 bytes Communication speed 10Mbps
Communication method Token bus method
Synchronous type Frame synchronization method Encoding method Manchester code
Transmission method Single bus
Transmission format HDLC standards (frame format)
Maximum number of networks
255 (Total number of PLC to PLC networks and remote I/O networks)
239 (Total number of PLC to PLC networks and remote I/O networks)
Network No.240 to No.250 cannot be set.
Alternate them with unused network No.
Maximum number of
groups 9
Number of stations
connected in one network 32 stations (Control station: 1, normal station: 31) Applicable cable 3C-2V, 5C-2V, 5C-FB
Overall distance 3C-2V: 300m 5C-2V, 5C-FB: 500m Distance between
stations
3C-2V: 300m 5C-2V, 5C-FB: 500m
Error control system CRC(X16 + X12 + X5 + 1) and retry by a time over
RAS function
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions Transient transmission • N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated link instruction, refer to Section 4.6.2.
Number of occupied I/O points
32 points per slot (I/O assignment:
special 32 points)
32 points per slot (I/O assignment: intelli. 32 points)
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
4.2.2 Cable performance comparisons
(1) Optical fiber cable
Overall distance and distance between stations do not differ depending on the optical fiber cable.
For overall distance and distance between stations, refer to Section 4.2.1.
(2) Coaxial cable (a) Overall distance
: Compatible, : Partial change required, ×: Incompatible
*1 When the overall distance does not satisfy the MELSECNET/H specifications, either use an A6BR10/A6BR10-DC type repeater unit in the network, or configure a separate network.
(b) Distance between stations
: Compatible, : Partial change required, ×: Incompatible