AEG SB4 series User Manual Page 123

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20
Specifications
75
4.2.3.3 RS 485 Communications Port (Modnet 1/SFB)
Use Connection to the distributed inputs/outputs
Networking with other programmable controllers
Connector pin assignment according to RS 485; see the module description for
BBS 1, chapter “Connactor pin assignment”
Type of transmission Symmetrically serial, isolated
Transmission with acknowledgement and broadcast
Bus arbitration: Master-Slave
Block transmission up to 20 bytes
CRC mark of conformity
Error correcting through repetition
Protective circuit between 0 V and chassis (PE) with 100 k,
varistor and capacitor
Transmission rates 62.5 kbits/s, 375 kbits/s, 2 Mbits/s; see also chapter
4.6.2 ”Permitted line lengths”
Cable termination both sides120
Number of nodes max. 28
Permitted slave addresses 126
4.2.3.4 PMB (Parallel Microprocessor Bus)
Supply voltage +5 VDC, -3 ... +4%
Data width 16 bits
Address width 20 bits
Plug and socket connectors C construction according to DIN 41 612
4.2.3.5 PEAB (Parallel I/O Bus)
Supply voltage +12 VDC, -12 VDC, ±5%
Data width 16 bits
Addressing Slot references, subaddresses and DKC addresses
Plug and socket connectors C connection according to DIN 41 612
4.2.3.6 PAB 1 (Parallel System Bus)
Use
Internal I/O bus for the DTA 112 and DTA 113 subracks. The data traffic is initiated by
the ”Busmaster” ALU or DEA 116, and the information transmitted from it to the “Slave”
process peripheral modules or vice versa.
Supply voltage +5 VDC, ±5%
Supply indicator green LED on DEA 116
Max. permitted current input 7.6 A per subrack for I/O nodes
Address capacity 8 192
Data width 8 bits
Addressable nodes max. 9
Interrupt level 1 (group interrupt)
Ready message 1
Transmission cycle time approx. 1 μs for 1 byte, (depending on the bus master)
Plug and socket connectors C construction according to DIN 41 612
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