Product specifications

Technical Data Appendix A Hardware Units
248 3BSE036351-510 A
Battery
The memory content is backed up with either an internal or external battery unit
(SB821). For back-up time see Table 54 .
COM4 Serial Communication
Communication speed 9600 baud
Signal levels RS-232C
Connector RJ45
Modem support No
Electrical ModuleBus
I/O capacity 1 x S800 I/O base cluster with up to 12 x S800 I/O units.
Supply current • Max 24 V – 1.0 A (short circuit proof, fuse 2 A fast)
• Max 5 V – 1.5 A (short circuit proof)
Supply voltage variation 24 V – follows the input power at L+
Optical ModuleBus
(2)
I/O capacity up to 7 x S800 I/O clusters each with 12 units
Connector • Duplex Fiber Optic Cable
• Simplex Fiber Optic Cable
CEX-Bus
(3)
Capacity up to 12 communication interfaces
Supply current Max 24 V – 2.4 A (fuse 3.15 A fast)
(1) Only (CN1) Ethernet Communication is supported for PM851A.
(2) Maximum one S800 I/O cluster is possible on the optical ModuleBus with PM851A.
(3) Maximum one communication interface on the CEX-bus is possible with PM851A.
The figures given in Table 54 are valid if the batteries are installed after a normal
CPU power-up, allowing for the memory back-up function to be activated.
Table 53. PM851A/PM856A/PM860A and TP830 Interfaces – Technical data
Item Value