InstallationABB Control - AC 31 Page 4-211SBC 260400 R1001-b 06.995.3. Addressing slave central units or remote extension units on the CS 31 busThe CS 31 protocol is a master / slave protocol: the master sends requests to the slaves whichare indicated by an address between 0 to 61.The master central unit can manage up to 31 connection points (CS 31 bus addresses).A connection point may be: a non-extensible remote unit an extensible remote unit with binary extensions a remote TCAD display a variable speed drive ABB NCSA-01 interface a high speed counter a central unit (50 series with extension possibilities, 90 or 30 series).Warning: an extensible remote unit with analog extensions counts 2 connection points.The master central unit, as well as the remote units, may be positioned in any order on thebus. The order of the extensions on the central units and remote extensible units is free.The addressing is not according to the order of the units on the bus. The addresses from 1 to61 may be attributed in any order to the slaves: the first remote unit on the CS 31 bus canhave address 5 followed by a remote unit with address 3 followed by another remote unit withaddress 12, and so on.5.3.1. Addressing extensible remote unitsThe slave number of the extensible remote units is given by the rotative switches situatedbeneath the first cover on the front face. Each switch can be set to 0 to 9. The switch 1 is fortens and the switch 3 is for units (see Figure 4-28). Values greater than 61 are not allowed.0 ≤ X ≤ 61.Limitation for analog extension:The maximum number of analog channel per extensible remote unit is:-8 analog inputs and 8 analog outputsThe maximum configuration per extensible remote unit is:-a maximum of 1 XE 08 B5 extension unit + 5 binary extension units may be used.-a maximum of 1 XTC 08 extension unit + 5 binary extension units may be used.-a maximum of 1 XE 08 B5 and 1 XTC 08 extension units + 4 binary extension units may beused.-a maximum of 2 XM 06 B5 extension units + 4 binary extension units may be used.
