Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) System, I/O and Communications Functions - Manual (Page 88)

Logic Functions - Book 1
LOOP BLOCK
4-6
4.2.1 ICN Communication Block Capabilities
The ICN communication block is responsible for two main functions. The first is to handle all
messages received since its last execution. The second is to handle the reporting and
acknowledgment of diagnostics for the configured port. The ICN Block executes once every
50 msec. Messages received by the port driver are checked for proper reception and
definition. After passing those checks, the ICN Block’s responsibility is to route the message
so it may be processed at the appropriate time and by the appropriate process.
A write message follows these rules: If from a computer source, then source must be
authorized; if another source of the same type is in control, then it is NAK’d; if the source is in
control, the write is done and the control timer is reset; if there is no controlling source, only
the write is done.
4.2.2 ICN Communication Block Parameters
The mnemonics, valid values, and data types for all fields that may be selected for display
and/or be used in making softwiring connections are listed in Table 4-1. The following further
defines the ICN Communication Block configuration parameters.
Block Type
ICN
This is the Instrument Communication Block type and is configured on the I/O
Block Selection page.
Occurrence
1 to 3
There may be up to three ‘instances’ allowed of the ICN communication block.
Source 1 ............................................................................................................................. C – –
Source 2 ............................................................................................................................. C – –
Source 3 ............................................................................................................................. C – –
Source 4 ............................................................................................................................. C – –
Source 5 ............................................................................................................................. C – –
The source information provides the instrument with a complete source address of a computer
assigned to the instrument.
ANY Entry made in Source 1 only. All computer sources are allowed.
Remaining source entries are ignored.
NONE No authorized computer write source is defined. Computer status is
inactive.
ICN Addr ICN Address switch setting (0 to 15) of ICN device (such as
MODCELL, SLU, or Communication Link)
Device Type The device type must match what is written to the communications
link by the device. Communications source can be:
SLU 0....Sequence and Logic Unit
PC30 1....PC-30 Workstation
M300 2....MOD 300 System
1180M 4....1180M
MODCELL 5....MODCELL type instrument
Other 6....All device types
Will this module include a termination resistor?
This configuration only question is used to determine module current load.