Hardware Manual

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

Saia-Burgess Controls AG

HALT switch on PCD2.M125 and PCD1.M135

CPUs and expansion housings

3

3.21 HALT switch on PCD1.M125 and PCD1.M135HALT switch on PCD1.M125 and PCD1.M135

Beside the IC socket for the user memory a switch is on the controllers PCD1.M125

and PCD1.M135. If this switch is pressed during starting the PCD controller, the con-

troler goes not into the run mode, but remains in the HALT mode.

Localization without interface module on

socket B

Localization with interface module on

socket B

The PCD controller changes only after a cold start into the Run Mode. I.e. the supply

of the control must be switched off/on for it, with not pressed switch.

3.21.1 HALT switch on PCD1.M125 and PCD1.M135 as inputHALT switch on PCD1.M125 and PCD1.M135 as input

The switch described above can be read in as entrance during normal operation. The

cover of the PCD must removed and the switch must be read in over a SYSRD com-

mand for this manipulation. So, this switch is only to use for special functions (start-

up, service ... ).

Instruction : SYSRD K 8000

R_Switch ; Diagnostic register

Description of the diagnostic register

bit state cause

0 (LSB) 1 (high) switch not pressed

0 (low) switch pressed