Hardware Manual

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Saia-Burgess Controls AG

Hardware clock (Real Time Clock)

CPUs and expansion housings

3

3.16 Hardware clock (Real Time Clock)

Most PCD1/PCD2 CPUs are fitted with a hardware clock:

CPU type Where is the hardware clock?

PCD1.M110 Not present, and cannot be fitted

PCD1.M120/M130 On the motherboard

PCD1.M125/M135 On the motherboard

PCD2.M110/M120

hardware version < H

On the optional PCD2.F5x0 Modules with hardware version A

(while stocks last)

PCD2.M110/M120

hardware version >= H

On the motherboard. Old PCD2.W5x0 Modules can also be fitted

with a hardware clock; in all cases, the clock on the motherboard

is used

PCD2.M150/M170/M480 On the motherboard

The presence of a hardware clock is an absolute requirement where the HeaVAC

library clock timers are used.

3.16.1 Clock module PCD2.F500 (obsolete, PCD2.M110/M120 only)

On the PCD2.M110/M120 with hardware version < H, a PCD2.F5x0 Module with

hardware clock (hardware version A) could be fitted where necessary.

The PCD2.F500 is a clock module without serial ports for socket B and allows a

hardware clock to be added to old controllers. It is no longer obtainable.