TReX User Manual v15.30 Firmware
examples to act as starting points when designing a PLC program for the TReX-460.
Key Terminology
Inputs:
These are sometimes referred to as relays or relay inputs in historical PLC devices. The TReX
PLC supports:
•
Physical digital and analog inputs on the local TReX and many remote TReX units.
•
Physical digital outputs on the local TReX and remote TReX units.
•
Work bits or temporary control outputs used for downstream program flow.
•
Hold bits or temporary control outputs used for downstream program flow. Hold bits
retain their values when power is removed.
•
Timers and counter operating flags.
•
Weekly, daily or hourly alarm enabled flags.
•
Macro completion flags used to sequence serial or wirelessly transmitted messages.
•
Serial match strings, allowing work bits to be set and controlled on serial input.
•
Greater than comparators, allowing logical operations to be performed on ADC inputs.
Outputs:
These are sometimes referred to as relay coils on some PLC devices. The TReX PLC
supports:
•
Physical digital outputs on the local TReX and up to 9 remote TReX units.
•
Up to 32 timers. Timers can be TON, TOF or RTON types.
•
Up to 16 counters. Counters are of the CTU up counting type.
•
Up to 64 bits/temporary “Work Bits” used for downstream program flow.
•
Up to 16 “Hold Bits” for retaining critical program flow states on power removal.
•
Up to 64 user-defined macros. This is a powerful feature that allows transmission or
command based reconfiguration of any aspect of TReX operation.
•
Up to 16 Daily or hourly alarms.
•
Support for “SET” and “RESET” control extensions to allow latched control of digital
outputs, work bits and hold bits.
Rung:
Line of ladder logic that includes up to 3 inputs and one optional output. When all used inputs
for a rung are “active” the rung is considered to be “energised”, allowing the output associated
with the rung to become “active”. The TReX supports up to 250 rungs of ladder logic
program.
Macro:
A user-defined command that can be triggered selectively as a PLC output. This can range
from configuration commands such as
*TX_FREQ
(used to set frequency) to message
transmissions such as
WT1234560A1B TEST
.
© WTE Limited, 2022 – Christchurch New Zealand
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