ELAU PMC-2 - System Variables (S); Not Wirable Logical System Variables

Instruction Manual PMC-2
BA * PMC-2 * EN * 01/98 Page 67
8.6 System variables (S)
Via system variable you have access to internal sizes.
There are the following data types of system variables:
• logical which can become the states high and low
• numerical which contain the corresponding numerical values
• enumeration type which have several states, e. g. 0, 1, 2 for the selection of options
• bit strings which contain codings or version numbers
We differ between input and output system variables. They are accordingly signed with I or O.
The designation of the variables is composed of the standard designation Sx.xx and of a symbolic
name. In the EPAS-3 variable editor and in the display they appear with both designations, in the ECL
it is referred to the variables with the standard designation.
The write access authorisation can be taken out of the listing. Basically, it is not possible to write on
output system variables, neither can you write on input system variables, if there are wired on
hardware inputs.
Logical system variables can be partly "wired". Wired means that they can be set on either an input or
output, into the memory or to a firm value. It is therefore possible to effectively profit by the hardware
I/Os. If, for example, the PMC-2 is always moved in the operating mode automatic, the input system
variable "E_Auto" (S1.11) will be firmly wired on high which saves one input. The "wiring" can be
achieved in EPAS-3. There is also a default assignment in the EPROM.
8.6.1 Not wirable logical system variables
Number
S
Designation Unit Data type Access level Min-Max
0.00 O_drive_turns Bool Nobody
0.01 O_pos_window Bool Nobody
0.02 free Bool Nobody
0.03 free Bool Nobody
0.04 free Bool Nobody
0.05 I_Start_Signal Bool Nobody
0.06 O_brake Bool Nobody
0.07 O_power_relay Bool Nobody
0.08 O_DC_short_circ Bool Nobody
0.09 O_T1_relay Bool Nobody
0.10 I_control_enable Bool Nobody
0.11 I_touchprobe_1 Bool Nobody
0.12 I_touchprobe_2 Bool Nobody
0.13 I_home_switch Bool Nobody
0.14 Limitswitch_pos Bool Nobody
0.15 Limitswitch_neg Bool Nobody
0.16 I_motor_temp Bool Nobody
0.17 I_emergency_off Bool Nobody
0.18 I_IRQ1 Bool Nobody
0.19 I_IRQ2 Bool Nobody