DE FAU LT DATA M AP
DATA MAPPING
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1TG C908004M0 201
9.2.9. Control Access
Control Access (CA) is a mechanism within MNS Digital to define and determine which user
interface has control rights to operate the M10x-M modules. These interfaces are defined be-
low in command handling. Control Access rights can be given, for example, by a specific com-
mand sent to switch operation rights from push-button (hardwired to M10x-M) to any other
interface connected via the MNS Digital Gateway (e.g. MView or DCS).
9.2.9.1. Command Handling
The control access command defines the control rights of defined interfaces for an
M10x-M.
Remote – M10x-M switches to Remote operation mode and can be operated
via Fieldbus from process control system (DCS / PLC)
Bus-Local – M10x-M switches to the Bus-Local mode and operation is
possible:
– via MView (local operation panel in switchboard) or
– via web interface (similar to MView).
Hardware-Local – M10x-M switches to the Hardware-Local mode and opera-
tion is possible only through digital inputs on M10x-M Hardware. Hardware-
Local must be activated by the setting the input on the M10x-Ml
Table 34 Command and Status for Control Access
Notes:
At any time any control station can obtain the control access by sending a control access
command to M10x-M. On MView (or web interface) the user must have the appropriate user
right to do so.
Hardware-Local must be activated by the setting the input on the M10x-M.
CA Remote is set if the command ‘Remote Control’ command is sent to the M10x-M from the
DCS. Only then it is possible to send switching commands from the DCS.
Command
Command
Status Bit
CA Interface
Auto Mode
(CA Remote)
Bus Local
(CA BusLocal)
Auto Mode
(Bus Control)
DCS only
1
0
1
MView (Web
interface)
0
1
1
Hardware Lo-
cal
(Hardware In-
puts)
X
X
0