Siemens 505-2557 - page 38

Advanced Function Programming
3-8 SIMATIC 505–2557 Installation and Operation Guide
Internal Register Structures (continued)
After the values are loaded to the module, WY registers are used like those
shown in T able 3-5.
T able 3-5 Function Enable Bits
WY65
WY66
WY67
WY68
WY69
WY70
WY71
WY72
WY73
WY74
WY75
WY76–96
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
Channel 1–16
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)
The control registers (X and Y discrete I/O points) are the handshake bits
and steering logic used to load the data into the SIMA TIC 505–2557 module
and to request special operations from the module. These registers consist of
the discrete inputs and outputs of the module.
The SIMA TIC 505–2557 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.
Contr ol Registers
Inputs