LB-762 Controller Installation Manual
LAB-EL
1.5
Cooperation with LB-760 regulators
LB-762 regulators can be used in systems where LB-760 regulators have been used so far. It is possible to build one common
system in which both types of regulators operate to provide performance of respective system functions regardless of the
type of regulator (such as common measurement of external air parameters and collective CO
2
concentration measurement
system).
Unfortunately owing to software incompatibility between the regulators and inconsistency of communication protocols it
is impossible to use a common RS-485 network for both types of regulators. LB-760 type regulators must have its own
RS-485 network, while LB-762 regulators must have their own, separate network. If LB-762 regulators use Ethernet, this
will necessarily be a separate network. If LB-762 regulators are connected by means of RS-485, one should route a separate
RS-485 network cable for LB-762 regulators.
presents a scheme of a sample common installation with LB-762 and LB-760 type regulators, using RS-485 network
for LB-762. The scheme with Ethernet network is analogous - LB-760 regulators remain connected by RS-485 network, while
for LB-762 RS-485 network should be replaced with Ethernet network.
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Rysunek 1.5: Scheme of a system with LB-762 and LB-760 regulators
1.6
Collective measurement of external air parameters
In the measuring system consisting of more regulators (both LB-762 and LB-760), it is possible to use a single hytherograph
to measure external air parameters. It is also possible to connect individual hytherographs to different regulators, but with
regard to the fact that they normally measure parameters of the same air, this is not reasonable. Use of a single meter
permits reduction of installation costs.
Connection of external hytherograph is independent from the type of applied data transmission network (Ethernet/RS-485).
On Figure
i Figure
external hytherograph is described as
LB-710 HYTHEROGRAPH
.
Hytherograph can be attached to any device in the network that has an S300 input. This may be LB-480 module (having
8 S300 inputs), as well as each of LB-762 regulators, having 2 S300 inputs (despite connection to individual regulator, the
whole system can be configured to use this hytherograph as a source of data for all other regulators). However, for reasons
of reliability of the system, it is advised to connect hytherograph to LB-480 unit – this module is common for the entire
system and operates independently of all regulators. In the case of connecting the hytherograph to LB-762 regulator when
the regulator is disabled or fails for some reason, the whole system of collective measurement of external air parameters will
cease to operate.
8
