Control Registers; Inputs; Function Enable Bits - Siemens SIMATIC 505 Installation And Operation Manual

Internal Register Structures (continued)

Control Registers

Inputs

3-8 Advanced Function Programming
After the values are loaded to the module, WY registers are used like those
shown in Table 3-5.
WY65 Channel 1–16
WY66 Channel 1–16
WY67 Channel 1–16
WY68 Channel 1–16
WY69 Channel 1–16
WY70 Channel 1–16
WY71 Channel 1–16
WY72 Channel 1–16
WY73 Channel 1–16
WY74 Channel 1–16
WY75 Channel 1–16
WY76–96
The control registers (X and Y discrete I/O points) are the handshake bits
and steering logic used to load the data into the SIMATIC 505–2556 module
and to request special operations from the module. These registers consist of
the discrete inputs and outputs of the module.
The SIMATIC 505–2556 input module uses a total of 5 discrete inputs in
advanced mode. Four of the inputs are used as handshake bits from the
module to the PLC to indicate that alarm levels, scaling data, filter and
averaging values and function enable bits have been transferred
successfully to the module. (See Figure 3-4).
The remaining input bit, X16, is used by the module to inform the controller
that the module is ready to accept data.
Table 3-5 Function Enable Bits
Low alarm enable bits
High alarm enable bits
Scaling enable bits
Digital filtering enable bits
Averaging enable bits
Peak hold enable bits
Valley hold enable bits
Fahrenheit/Centigrade select bits
Peak hold reset bits
Valley hold reset bits
Averaging reset with new value bits
(Not used)
SIMATIC 505–2556 Installation and Operation Guide