Operation
025-9209K
28
SYSTEM OPERATIONAL LIMITS
Inputs
Chatter
Chattering occurs when a status being monitored changes
rapidly, that is, more than once every few seconds.
Chattering can cause the RTU to send multiple reports using
excessive airtime. The debounce time and hog time in the
RTU should be used to prevent excessive transmissions.
Broken Connection
Analog Input
- The voltage read by the analog input would
float, following the voltage of the previous analog input.
More than 5 k
Ω
source impedance will increase
susceptibility to noise.
Digital Input
- The digital inputs have a +12 V
dc
pull up and
will read a logic high with nothing connected.
Outputs
Power Up State
The analog inputs power up in a 0 volt state. The digital
outputs power up in a high impedance, open collector state.
Power Off State
The analog inputs power off in a 0 volt state. The digital
outputs power off in a high impedance.
Unit Over Voltage
Over voltage damage to any of the I/O, power supply, or RF
inputs caused by lightning, improper connection, etc. can
cause unpredictable behavior in any of the electronic
components. The RTU provides safeguards against this type
of damage, but damage is still possible. Full testing of
suspect hardware should be performed.
RS-232
Currently the RTU only uses the serial port for
programming. If the RTU is left in programming mode, the
unit times out after 30 seconds and normal operation
resume. While in programming mode, transmission and
reception of data via FFSK is suspended.
Содержание 1708
Страница 1: ...Models 1708 and 1716 Remote Terminal Units Installation and Operation Manual 025 9209K...
Страница 8: ...Contents 025 9209K 8...
Страница 56: ...025 9209K 56...
Страница 60: ...Repair 025 9209K 60 MODEL 1700 SERIES ENCLOSURE OUTLINE 024 0057B...
Страница 61: ...Repair 025 9209K 61 MODEL 1700 SERIES ENCLOSURE INSTRUCTIONS 024 0056D Sheet 1 of 2...
Страница 62: ...Repair 025 9209K 62 024 0056D Sheet 2 of 2...
Страница 63: ...Repair 025 9209K 63 MODEL 1708 REMOTE TERMINAL UNIT SILKSCREEN 702 9439F...
Страница 64: ...Repair 025 9209K 64 MODEL 1716 REMOTE TERMINAL UNIT SILKSCREEN 702 9440F...
Страница 72: ...Appendix B 025 9209K 72...
Страница 80: ...Glossary 025 9209K 80...